/buy"ooh, buy"oh/ , n. , pl. bayous . 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.
[ 1710-20, Amer.; bayuk river forming part of a delta ]