/ Dictionary / Index H hippo: Meaning and Definition of Find definitions for: hip•po Pronunciation: (hip'ō), [key] — pl. -pos. hippopotamus. Hip•po Pronunciation: (hip'ō), [key] — n. See hippo- Pronunciation: [key] a combining form appearing in loanwords from Greek, where it meant “horse” (hippodrome); on this model, used in the formation of compound words (hippology). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hippo (Thesaurus) hippiedom hippocampal Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language