What's the longest word in the dictionary (Medical or regular)?

Answer 1

pneumonoultramicroscopicsilicovolcanoconiosis (refers to a lung disease)-- 45 letters

Answer 2

Floccinaucinihilipilification (29 letters), is famous for being the longest word in the Oxford English Dictionary, however, this is now only true of the first edition, the second edition contains a few even-longer words. The word itself was a joke word of the 18th and 19th century literati, stemming from an Eton grammar school Latin drill.

Llanfairpwllgwyngyll - 20 (longest place name; Welsh)
humuhumunukunukuapuaa - 21

dihydroxyphenylalanine - 22

hexamethylenetetramine - 22

pseudomonocotyledonous - 22

honorificabilitudinity - 22

interdenominationalism - 22

gynotikolobomassophile - 22

bathysiderodromophobia - 22

dichlorodifluoromethane - 23

polytetrafluoroethylene - 23

quasihemidemisemiquaver - 23

inanthropomorphisability - 24

sphragidonychargokometes - 24 (Ancient Greek)

pseudorhombicuboctahedron - 25

honorificabilitudintatibus - 26 (longest in Shakespeare)

antidisestablishmentarianism - 28

tetramethyldiamidobenzhydrols - 29

floccinaucinihilipilification - 29 (longest in OED 1st ed.)

hippopotomonstrosesquipedalian - 30 (Mrs Byrne's Dict.)

dichlorodiphenyltrichloroethane - 31 (longest in Macquarie Dict.)

praetertranssubstantionalistically - 34 (M McShane)

supercalifragilisticexpialidocious - 34

necropurogeohydrocheirocoscinomancy - 35 (Thomas Tomkis)

cholangiocholecystocholedochectomies - 36 (Mrs Byrne's Dict.)

hepaticocholangiocholecystenterostomies - 39 (Gould's Medical Dict.)

osteoarch?matosplanchnochondroneuromuelous- 42 (TL Peacock)

pneumonoultramicroscopicsilicovolcanokoniosis - 45 (longest in OED 2nd ed. & Websters)

antipericatametaanaparcircumvolutiorectumgustpoops - 50 (Rabelais)

aequeosalinocalcalinoceraceoaluminosocupreovitriolic - 52 (Mrs Byrne's Dict.; chem)

osseocarnisanguineoviscericartilagninonervomedullary - 52 (TL Peacock)

Answer 3

It depends . . .
It might be supercalifragilisticexpialidocious (which appears in the Oxford English Dictionary), unless you want to count names of diseases (such as 'pneumonoultramicroscopicsilicovolcanoconiosis', or places (such as 'Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch', a village in Wales), chemical compounds (apparently there is one that is 1,913 letters long),

Other words famous for being sesquipedalian:

antidisestablishmentarianism ("opposition to the disestablishment of the Church of England")
floccinaucinihilipilification
honorificabilitudinitatibus (Which appears in Shakespeare's Love's Labour's Lost, and which has been cited as [dubious] evidence that Francis Bacon wrote Shakespeare's plays)

Or perhaps smiles is the longest word — after all, there is a mile between the first letter and the last.

Answer 4

Okay this is a gay joke but I have to write it SMILE (cause after the s there is a mile!) HEE HEE HAA HAA.♥

Answer 5

which language and then then dictionary.

Answer 6

in the english language/non-medical:
antidisestablimentarianism