English has around a thousand 19 letter words, and most of them belong to chemistry, medicine, and the sciences. Plenty still reach ordinary reading, though: you will find unconstitutionality in a court report and counterintelligence in a news bulletin. Each one is built from smaller parts you already know, which is what makes it readable once you find the seams.
List Of 19 Letter Words
A 19 letter word is an English word made of exactly 19 letters, written as one unbroken word. A hyphenated phrase stretched to 19 characters does not count, which is why some lists run far longer than the dictionary supports.
Starting letters are spread far from evenly. P produces the most by a wide margin, followed by C, S, O, and A. At the other end, no English word of exactly 19 letters begins with W or Y, and only one begins with J: jurisprudentialists.
19 Letter Words Starting With A
- Abdominohysterotomy
- Absorptiometrically
- Accommodativenesses
- Acetylaminobenzenes
- Acetylaminofluorene
- Acoustoelectrically
- Acylphloroglucinols
- Adenochondrosarcoma
- Adenomyoepithelioma
- Adrenocorticotropic
- Adrenocorticotropin
- Adventuresomenesses
- Aeromicrobiological
- Aeromicrobiologists
- Agammaglobulinemias
- Allotransplantation
- Allotriomorphically
- Allylthiocarbamides
- Aminoanthraquinones
- Aminoethylcarbazole
- Aminopolysaccharide
- Anarchosyndicalists
- Anatomicophysiology
- Anatomopathological
- Andromonoeciousness
- Angiocardiographers
- Angiocardiographies
- Angiocardiographist
- Angusticanaliculate
- Anthropocentrically
- Anthropogeographers
- Anthropogeographies
- Anthropomorphically
- Anthropomorphitical
- Anthropomorphitisms
- Anthropomorphologic
- Anticholinesterases
- Anticommercialistic
- Anticonservationist
- Anticonventionalist
- Antidesertification
- Antieducationalists
- Antiferromagnetical
- Antiferromagnetisms
- Antifluoridationist
- Antifundamentalists
- Antiimperialistical
- Antimonarchicalness
- Antinonconformistic
- Antiparliamentarian
- Antirevolutionaries
- Antisocialistically
- Antivivisectionists
- Arachibutyrophobics
- Archaeoastronomical
- Archaeogeologically
- Archaeometallurgies
- Astrophotographical
- Auriculoventricular
- Authoritativenesses
- Autodecrementations
- Autodifferentiating
- Autodifferentiation
- Autohaemagglutinins
- Autohaemotherapists
- Autohemotherapeutic
- Autoincrementations
- Autophosphorylating
- Autophosphorylation
- Autophosphorylators
- Autotransplantation
- Azoisobutyronitrile
19 Letter Words Starting With B
- Bacteriochlorophyll
- Bacteriotherapeutic
- Ballistocardiograms
- Ballistocardiograph
- Barothermohygrogram
- Benzophenanthrazine
- Bourgeoisifications
19 Letter Words Starting With C
- Cartilaginification
- Characterologically
- Chlorofluorocarbons
- Chlorofluoromethane
- Chromatographically
- Chromoblastomycosis
- Chromolithographers
- Chromolithographies
- Chromolithographing
- Cinematographically
- Circumstantialities
- Clinicopathological
- Communicativenesses
- Companionablenesses
- Compassionatenesses
- Complementarinesses
- Comprehensibilities
- Comprehensivenesses
- Conceptualistically
- Conscientiousnesses
- Consequentialnesses
- Constitutionalities
- Constitutionalizing
- Contemplativenesses
- Contemporaneousness
- Contradictorinesses
- Contradistinctively
- Contradistinguished
- Contradistinguishes
- Conventionalisation
- Conventionalization
- Counteradvertisings
- Counterconditioning
- Counterconspiracies
- Counterculturalisms
- Counterdemonstrated
- Counterdemonstrates
- Counterdemonstrator
- Counterinflationary
- Counterinstitutions
- Counterinsurgencies
- Counterintelligence
- Countermobilization
- Counterprogrammings
19 Letter Words Starting With D
- Dehydrochlorinating
- Dehydrochlorination
- Deindustrialization
- Deinstitutionalized
- Deinstitutionalizes
- Demonstrativenesses
- Dendrochronological
- Dendrochronologists
- Deoxyribonucleotide
- Departmentalization
- Diastereoisomerisms
- Diethylcarbamazines
- Diethylstilbestrols
- Diethylstilboestrol
- Differentiabilities
- Dihydrostreptomycin
- Dimethylnitrosamine
- Dimethyltryptamines
- Directionlessnesses
- Disadvantagednesses
- Disadvantageousness
- Disenfranchisements
- Disinterestednesses
- Dispassionatenesses
19 Letter Words Starting With E
- Echoencephalography
- Electrocardiographs
- Electrocardiography
- Electrocorticograms
- Electrodesiccations
- Electrodynamometers
- Electroluminescence
- Electromagnetically
- Electromechanically
- Electrometallurgies
- Electronegativities
- Electrophoretically
- Electrophoretograms
- Electrophotographic
- Electrophysiologies
- Electrophysiologist
- Electroretinographs
- Electroretinography
- Encephalomeningitis
- Encephalomyelitides
- Entrepreneurialisms
- Establishmentarians
19 Letter Words Starting With F, G
- Facioscapulohumeral
- Gastroenterological
- Gastroenterologists
- Gedankenexperiments
- Gentlemanlikenesses
- Glottochronological
19 Letter Words Starting With H
- Hemidemisemiquavers
- Heterogeneousnesses
- Histopathologically
- Historiographically
- Homotransplantation
- Hydrochlorothiazide
- Hydrometeorological
- Hydrometeorologists
- Hydroxytetracycline
- Hyperconcentrations
- Hyperemotionalities
- Hyperexcitabilities
- Hyperirritabilities
- Hyperparathyroidism
- Hypersensitizations
- Hypersusceptibility
- Hypoadrenocorticism
- Hypolipoproteinemia
- Hypoparathyroidisms
19 Letter Words Starting With I
- Immunocytochemistry
- Immunofluorescences
- Immunohematological
- Immunohematologists
- Immunohistochemical
- Immunoprecipitating
- Immunoprecipitation
- Impressionabilities
- Impressionistically
- Inappropriatenesses
- Incommunicabilities
- Incomprehensibility
- Inconceivablenesses
- Inconsideratenesses
- Inconspicuousnesses
- Incontrovertibility
- Indefatigablenesses
- Indescribablenesses
- Indestructibilities
- Indeterminatenesses
- Indispensablenesses
- Individualistically
- Inefficaciousnesses
19 Letter Words Starting With J, L
- Jurisprudentialists
- Knowledgeablenesses
- Laparothoracoscopic
- Leukoencephalopathy
- Lexicostatistically
- Lipopolysaccharides
19 Letter Words Starting With M
- Machiavellistically
- Macrolinguistically
- Macropathologically
- Macrostratification
- Magnetohydrodynamic
- Magnetostratigraphy
- Mandibulopharyngeal
- Medroxyprogesterone
- Meningoencephalitic
- Meningoencephalitis
- Methylcholanthrenes
- Methylprednisolones
- Microdensitometries
- Microelectronically
- Microencapsulations
- Micrometeorological
- Micrometeorologists
- Micropaleontologies
- Micropaleontologist
- Miscellaneousnesses
- Mischaracterization
- Mucopolysaccharides
- Multidimensionality
- Multitudinousnesses
19 Letter Words Starting With N
- Nanoemulsifications
- Neoappendicostomies
- Neovascularizations
- Neurodiagnostically
- Neurofibromatosises
- Neurolinguistically
- Neuropathologically
- Neuropharmacologies
- Neuropharmacologist
- Neuroradiologically
- Nonadministratively
- Nonadrenocortically
- Nonarteriosclerotic
- Nonenforceabilities
- Noninterventionists
- Nonproductivenesses
- Nonrelativistically
- Nonrepresentational
19 Letter Words Starting With O
- Objectionablenesses
- Occipitoposteriorly
- Oligodendrogliomata
- Ontoepistemological
- Oophorocystectomies
- Operationalisations
- Operationalizations
- Ophthalmometrically
- Ophthalmoscopically
- Ophthalmostatometer
- Otorhinolaryngology
- Overambitiousnesses
- Overcapitalizations
- Overcentralizations
- Overclassifications
- Overcommercializing
- Overdifferentiation
- Overgeneralizations
- Overidentifications
- Overindustrializing
- Overintellectualize
- Overinterpretations
- Overproportionately
- Overrepresentations
- Oversensitivenesses
- Oversimplifications
- Overspecializations
- Ovolactovegetarians
- Ovoviviparousnesses
19 Letter Words Starting With P
- Palaeobiogeographer
- Palaeobiogeographic
- Palaeoceanographers
- Palaeoceanographies
- Palaeoclimatologist
- Palaeodendrological
- Palaeodendrologists
- Palaeoentomological
- Palaeoentomologists
- Palaeoenvironmental
- Palaeoethnographers
- Palaeoethnographies
- Palaeoherpetologist
- Palaeoichthyologist
- Palaeotypographical
- Palaeotypographists
- Paleoanthropologies
- Paleoanthropologist
- Paleobiochemistries
- Paleobiogeographers
- Paleoclimatologists
- Paleogeographically
- Paradichlorobenzene
- Parasympathomimetic
- Parathyroidectomies
- Parthenogenetically
- Perspicaciousnesses
- Phacoemulsification
- Pharmacodynamically
- Phenomenalistically
- Phenylpropanolamine
- Phenylthiocarbamide
- Phonocardiographies
- Phosphatidylcholine
- Phosphoenolpyruvate
- Phosphofructokinase
- Phosphoglucomutases
- Phosphomonoesterase
- Photoconductivities
- Photodecompositions
- Photodisintegrating
- Photodisintegration
- Photofluorographies
- Photointerpretation
- Photoreconnaissance
- Photosensitizations
- Phytogeographically
- Phytohemagglutinins
- Pneumoencephalogram
- Polychromatophilias
- Polyesterifications
- Polyribonucleotides
- Postmillenarianisms
- Posttranscriptional
- Prefigurativenesses
- Preternaturalnesses
- Professionalisation
- Professionalization
- Proletarianizations
- Pseudohallucination
- Pseudosophisticated
- Psychopharmacologic
- Psychophysiological
- Psychophysiologists
- Psychotomimetically
19 Letter Words Starting With Q, R
- Quintessentialising
- Radioallergosorbent
- Radioastronomically
- Radiocinematographs
- Radiopharmaceutical
- Reconceptualization
- Reindustrialization
- Reinstitutionalized
- Reinstitutionalizes
- Reprehensiblenesses
- Representationalism
- Representationalist
- Resorcinolphthalein
- Reticuloendothelial
- Revolutionarinesses
19 Letter Words Starting With S
- Salpingoophorectomy
- Salpingostomatomies
- Sanctimoniousnesses
- Schizophrenetically
- Schizosaccharomyces
- Schoolmasterishness
- Sclerochronologists
- Seismocardiographic
- Semiconsciousnesses
- Seminationalisation
- Seminationalization
- Semisocialistically
- Semitransparentness
- Sensationalisations
- Sensationalizations
- Sentimentalizations
- Sociolinguistically
- Spectrofluorimeters
- Spectrofluorometers
- Spectrofluorometric
- Spectrophotometries
- Splendiferousnesses
- Stereophotographies
- Stereospecificities
- Sternocleidomastoid
- Straightforwardness
- Structurelessnesses
- Superadministrators
- Superconductivities
- Superspecialization
- Symptomatologically
19 Letter Words Starting With T
- Tectonostratigraphy
- Telecommunicational
- Telehydrobarometers
- Tenderheartednesses
- Terephthalaldehydes
- Territorializations
- Tetrachloroethylene
- Tetrafluoroethylene
- Tetramethyldiarsine
- Thermoelectricities
- Thermoluminescences
- Thermoperiodicities
- Transformationalist
- Transmogrifications
- Transplantabilities
- Transubstantiations
- Tridimensionalities
19 Letter Words Starting With U To Z
- Ultracentrifugation
- Ultracontemporaries
- Ultrasegregationist
- Unapproachabilities
- Unceremoniousnesses
- Uncommunicativeness
- Uncompetitivenesses
- Unconscientiousness
- Unconscionabilities
- Unconstitutionality
- Uncontrollabilities
- Unconventionalities
- Undemonstrativeness
- Underrepresentation
- Understandabilities
- Unexceptionableness
- Unfashionablenesses
- Unidimensionalities
- Unintelligibilities
- Unpretentiousnesses
- Unproblematicalness
- Unselfconsciousness
- Vasovesiculectomies
- Vectorcardiographic
- Xenotransplantation
- Zosterophyllophytes
Common 19 Letter Words With Meanings
Around thirty words of this length turn up in ordinary reading: news reports, court coverage, medical letters, science writing. Learn these thirty and the rest of the length stops feeling strange.
- Counterintelligence: the work of blocking another country’s spying, carried out by agencies such as MI5 and the FBI.
- Straightforwardness: the quality of being direct and honest, with nothing held back.
- Mischaracterization: a description of someone or something that is unfair or plain wrong.
- Unconstitutionality: the state of breaking the rules set out in a country’s constitution.
- Underrepresentation: having fewer people from a group than their share of the population would suggest.
- Individualistically: in a way that puts your own goals ahead of the group’s.
- Anthropomorphically: in a way that gives human qualities to animals, objects, or natural forces.
- Incomprehensibility: the quality of being impossible to understand.
- Contemporaneousness: the fact of two events happening at the same time.
- Disenfranchisements: acts that strip people of the right to vote.
- Deindustrialization: the decline of factories and heavy industry across a region.
- Departmentalization: the splitting of an organisation into separate departments.
- Professionalization: the process by which an occupation gains formal training, standards, and status.
- Oversimplifications: explanations stripped of so much detail that they mislead.
- Transubstantiations: in Catholic teaching, the changing of bread and wine into the body and blood of Christ.
- Establishmentarians: people who support an official state church, or the existing order more broadly.
- Cinematographically: in terms of how a film is shot, framed, and lit.
- Electromagnetically: by means of electric and magnetic force acting together.
- Electroluminescence: light produced when current passes through certain materials, the effect behind LED screens.
- Sternocleidomastoid: the long neck muscle joining the skull behind the ear to the collarbone, the one that turns your head.
- Electrocardiography: the recording of the heart’s electrical activity, the test behind an ECG trace.
- Gastroenterologists: doctors who treat the stomach, intestines, and the rest of the digestive system.
- Hydrochlorothiazide: a widely prescribed diuretic tablet for high blood pressure.
- Otorhinolaryngology: the medical field covering the ear, nose, and throat.
- Xenotransplantation: the transplanting of organs or tissue from one species into another, such as a pig heart into a person.
- Hemidemisemiquavers: in music, the shortest standard notes, each one sixty-fourth of a whole note.
- Nonrepresentational: describing art that depicts nothing recognisable from the physical world.
- Photoreconnaissance: intelligence gathering by aerial or satellite photography.
- Unselfconsciousness: ease in front of other people, free of any worry about how you look.
- Superconductivities: states in which a material conducts electricity with zero resistance.
Long Words In Science And Medicine
Read down the list and the reason for the length becomes obvious. Technical English builds words by joining Greek and Latin parts end to end, and each part names one thing. Otorhinolaryngology is four parts long because it names three organs and a field of study.
| Part | Meaning | 19 letter example |
|---|---|---|
| electro- | Electricity | Electrocardiography |
| photo- | Light | Photodisintegration |
| hydro- | Water | Hydrometeorologists |
| immuno- | Immune system | Immunohistochemical |
| -ectomy | Surgical removal | Parathyroidectomies |
| -ology | Field of study | Micropaleontologist |
| -graphy | Recording or writing | Echoencephalography |
That is also why P and C produce more of these words than any other letter. They open the largest prefix families in scientific English, among them photo-, phospho-, chloro-, and chromo-.
How To Break Down Long Words
Length is not difficulty. A word this long is three or four short parts joined together, and once you find the seams it reads at normal speed.
counterintelligence: counter + intelligence. One prefix meaning against, one everyday noun. Intelligence work aimed against someone else’s intelligence work.
deindustrialization: de + industrial + ization. De- reverses, industrial names the thing, and -ization turns it into a process.
otorhinolaryngology: oto + rhino + laryngo + logy. Ear, nose, throat, study. Four parts, four meanings, nothing to memorise.
unconstitutionality: un + constitution + al + ity. Peel the outer layers away and an ordinary word is left in the middle.
The method works every time. Find the familiar word at the centre, name the prefixes in front of it, then read the ending for the part of speech: -ly makes an adverb, -ness and -ity make nouns, -ical makes an adjective. Shorter words split the same way, so 14 letter words make a gentler place to practise, with one part fewer to unpick.
Long Words In Scrabble And Crosswords
A Scrabble board measures 15 squares across, so a word this long will never physically fit on it whatever tiles you draw. The same limit applies to Words With Friends. Wordle asks for five letters, so these words never enter play there either. 15 letters is the longest word the board allows, and even that demands a bingo lane nobody leaves open.
Crossword grids are where long answers actually live. American daily grids are 15 squares across as well, but Sunday grids reach 21, wide enough for a 19 letter answer to fill an entire row. Most answers that long are phrases or compounds rather than single dictionary words, which is why setters reach for them at the edges of a puzzle rather than the centre.
Related:
FAQs
Recognisable examples are counterintelligence, straightforwardness, sternocleidomastoid, and electroluminescence. Others at the same length are unconstitutionality, mischaracterization, individualistically, and transubstantiations.
No. Around a thousand of them exist, against the roughly 171,000 words in current use recorded by the Oxford English Dictionary, and almost none reach everyday speech.
The longest word recorded in the Oxford English Dictionary is pneumonoultramicroscopicsilicovolcanoconiosis, at 45 letters. It names a lung disease caused by inhaling fine silica dust. In ordinary argument the longest is antidisestablishmentarianism, at 28.
No. Neither W nor Y produces a single word of exactly 19 letters, which leaves 24 of the 26 letters in play.
Break it into parts rather than letters. Find the ordinary word at the centre, name the prefixes in front of it, then read the ending for the part of speech. Three or four chunks stay in memory; 19 loose characters do not.
No. A Scrabble board measures 15 squares in each direction, so a word of 19 letters cannot be placed on it at all, however the tiles fall.
P, by a wide margin. C comes next, then S, O, and A. Between them those five letters account for close to half the set.
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