/ Dictionary / Index P protomorphic: Meaning and Definition of Find definitions for: pro•to•mor•phic Pronunciation: (prō"tu-môr'fik), [key] — adj. Biol. having a primitive character or structure. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. protomartyr proton Related Content Daily Word Quiz: labyrinth Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language