Hippopotomonstrosesquippedaliophobia

Hippopotomonstrosesquippedaliophobia is a humorous term that refers to the fear of long words. It is a made-up word that is one of the longest words in the English language. The word is a combination of several Greek and Latin words, including "hippopotamus," "monster," "sesquipedalian" (meaning "a foot and a half long"), and "phobia" (fear).