/ Dictionary / Index P prosoma: Meaning and Definition of Find definitions for: pro•so•ma Pronunciation: (prō-sō'mu), [key] — pl. -mas, -ma•ta an anterior body region, esp. the arthropod cephalothorax. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. prosody prosopopoeia 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