What is the longest word you know?

Pneumonoultramicroscopicsilicovolcanoconiosis.

However, the longest word I can spell por memory is antidisestablishmentarianism.

Fake word: Supercalifragilisticexpialidocious.

Foreign language word: Donaudampfschifffahrtsgesellschaftskapitän (we learned it in german class a few years ago; it means captain of the Danube steamship company)

Scientific word: Micropachycephalosaurus (I used to be obsessed w/ dinossauros :))

And I can't think of any regular English word lol

Hippopotomonstrosesquippedaliophobia. That's the fear of long words.

Wikipedia can do you one better.
link

An Ancient Greek word used for a cooking recipe.

''Λοπαδοτεμαχοσελαχογαλεοκρανιολειψανοδριμυποτριμματοσιλφιολιπαρομελιτοκατακεχυμενοκιχλεπικοσσυφοφαττοπεριστεραλεκτρυονοπτοπιφαλλιδοκιγκλοπελειολαγῳοσιραιοβαφητραανοπτερυγών'' !!!!

ランヴァイル・プルグウィンギル・ゴゲリフウィルンドロブル・ランティシリオゴゴゴホ

I translated it and it came back as: Llanfairpwllgwyngyll

sorry, i have Hippopotomonstrosesquippedaliophobia, i cant answer this

Pneumonoultramicroscopicsilicovolcanoconiosis is the longest word in the world. It refers to a lung decease. Basically the fancy for Silocosis. ;)

Longestwordhereisthislongwordthatihavebeenplayingbattlefield4andwatchingLENARRvineomgthisislongestwordvladimirputincansaythiswordfasterthenme

Elf.

ok idk how to spell it, but here is my best guess of how to spell it:
Supercalifagulisticecxpealidoshios