/ Dictionary / Index B birth defect: Meaning and Definition of Find definitions for: birth' de"fect Pronunciation: [key] — Pathol. Pathol. any physical, mental, or biochemical abnormality present at birth. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. birthday suit birthing 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