The Longest Words in English

main source: A Word a Day

1. The longest word in the OED (45 letters, 19 syllables):
pneumonoultramicroscopicsilicovolcanoconiosis n [NL, fr. Gk pneumo-n + ISV ultramicroscopic + NL silicon + ISV volcano + Gk konis dust] : a pneumoconiosis caused by the inhalation of very fine silicate or quartz dust

pronunciation: pneumo-no-ultra-microscopic-silico-volcano-coniosis

2. hippopotomonstrosesquipedalian adj : pertaining to a very, very long word

From Mrs. Byrne's Dictionary of Unusual, Obscure, and Preposterous Words

pronunciation: hippopoto-monstro-sesquipedalian

3. floccinaucinihilipilification humorous. [f. L. flocci, nauci, nihili, pili; words signifying `at a small price' or `at nothing' enumerated in a well-known rule of the Eton Latin Grammar + -fication] The action or habit of estimating as worthless.

pronunciation:` `ni.hili.`ka--sh*n

4. antidisestablishmentarianism [fr. anti- + disestablishmentarian + -ism.] Properly, opposition to the disestablishment of the Church of England(rare): but popularly cited as an example of a long word. So antidisestablishmentarian.

5. The longest word Shakespeare ever used:
honorificabilitudinity Obs. rare - 0. [ad. med.L. honorificabilitudinitas (Mussatus c 1300 in Du Cange), a grandiose extension of honorificabilitudo, honourableness

6. not too long, but a fun word, nonetheless:
om.pha.lo.skep.sis n [NL, fr. Gk omphalos + skepsis examination--more at spy] (1925): contemplation of one's navel as an aid to meditation; also: inertia 2

7. deinstitutionalization Chiefly N. Amer. [fr. de- II. 2 + institutionalization] The process or action of removing (a person) from an institution, such as a mental hospital, or from the effects of institutional life.

8. supercalifragilisticexpialidocious a. Also supercalifragilistic; formerly also other varr. [Fanciful: cf. SUPER a. 3.] A nonsense-word used esp. by children, now chiefly expressing excited approbation: fantastic, fabulous.

9. Stewardesses is the longest word that is typed with only the left hand.

10. Homophony, monophony, and polyphony are the longest words typed with only the right hand.

11. Zoopharmacognosy is "the study of how animals medicate themselves. When animals are sick, they know what plants to eat to cure themselves." -- Eloy Rodriguez

12. Uncopyrightable is the longest word with no duplicate letters.

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