What is the longest word in French?

The longest word in French is,

the longest word in French

” hippopotomonstrosesquippedaliophobie” (36 letters) is the fear (or phobia) of long words.

The word is formed from the Latin word sesquipedalian (singular sesquipedalis), which the Ancient Roman poet Horace used in Ars Poetica to describe excessively long words; literally, it means "a foot-and-a-half long". 

The length of the word hippopotomonstrosesquippedaliophobie is embellished with the prefix hippopotomonstro ("monster hippopotamus"), which is a characterisation of the feared words.

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