Possibly the longest real word in English, other than Antidisestablishmentarianmism.

Defined medically as "the fear of long words."
Patient: Doctor, I think I have a fear of long words.

Doctor: Ah! Yes! You have hippomonstrosesquippedaliophobia.

Patient: AHH!
by Yangis Kan July 30, 2004
Hippomonstrosesquippedalophia is the fear of long words.
Henry: Why is the fear of long words called Hippomonstrosesquippedaliophobia? The person who called it this way is mean. Hey, Brian, where did you go?
by CrispyliciousChicken May 12, 2016