/ Dictionary / Index B brain wave: Meaning and Definition of Find definitions for: brain' wave" Pronunciation: [key] Usually,electrical potentials or impulses given off by brain tissue. Cf. alpha rhythm, beta rhythm, delta rhythm. a sudden idea or inspiration; brainstorm. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: brainwave (Thesaurus) brainwashing brainwork Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language