Mouthful

Composed in 390 B.C., Aristophanes’ play Ecclesiazusae concludes with the name of a dish on which the characters plan to feast.

The word is lopadotemachoselachogaleokranioleipsanodrimupotrimmatosilphioliparomelitoaktakexhumeno-kichlepikossuphophattoperisteralektruonoptopiphallidokinklopeleioplagoosiraiobaphetragalopterugon. At 169 letters, it’s still the longest word in the Greek language.