/ Dictionary / Index P prostomiate: Meaning and Definition of Find definitions for: pro•sto•mi•ate Pronunciation: (prō-stō'mē-āt"), [key] — adj. having a prostomium. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. prostitution prostomium Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language