Pronunciation: (bī'OO, bī'ō), [key]
—pl. -ous. Chiefly Lower Mississippi Valley and Gulf States.
1. a marshy arm, inlet, or outlet of a lake, river, etc., usually sluggish or stagnant.
2. any of various other often boggy and slow-moving or still bodies of water.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.