/ Dictionary / Index B biodegrade: Meaning and Definition of Find definitions for: bi•o•de•grade Pronunciation: (bī"ō-di-grād'), [key] — -grad•ed, -grad•ing. to decay and become absorbed by the environment: toys that will biodegrade when they're discarded. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: biodegrade (Thesaurus) biodegradable biodeterioration Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language