Dictionary
pro•so•ma
Pronunciation: (prō-sō'mu), [key]—
n.,
—pl. -mas, -ma•taPronunciation: (-mu-tu). [key]
Zool.
an anterior body region, esp. the arthropod cephalothorax.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.