/ Dictionary / Index B birdbrain: Meaning and Definition of Find definitions for: bird•brain Pronunciation: (bûrd'brān"), [key] — n. Slang. a stupid, foolish, or scatterbrained person. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: birdbrain (Thesaurus) birdbath birdcage Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language