Dictionary
pe•rei•on
Pronunciation: (pu-rī'on, -rā'-, -rē'-), [key]—
n.,
—pl. -rei•aPronunciation: (-rī'u, -rā'u, -rē'u). [key]
(in a crustacean) the thorax.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.