/ Dictionary / Index B birthday suit: Meaning and Definition of Find definitions for: birth'day suit" Pronunciation: [key] bare skin; nakedness: They were sunbathing in their birthday suits. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. birthday birth defect Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language