Hippopotomontrossesquippedaliaphobia Share definition Flag Fear of long words; scared of long words he suffers from hippopotomonstrossesquippedaliaphobia. Hippopotomontrossesquippedaliaphobia by Jeff February 27, 2005 0 0 Get merch Get the Hippopotomontrossesquippedaliaphobia mug. Buy Now — $32.95 See more merch