The Longest Words in English

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

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.

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