/ Dictionary / Index B bayou: Meaning and Definition of Find definitions for: bay•ou Pronunciation: (bī', bī'ō), [key] — pl. -ous. a marshy arm, inlet, or outlet of a lake, river, etc., usually sluggish or stagnant. 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. See also: bayou (Thesaurus) Bayonne bay poplar Related Content Daily Word Quiz: overture Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language