/ Dictionary / Index B biological: Meaning and Definition of Find definitions for: bi•o•log•i•cal Pronunciation: (bī"u-loj'i-kul), [key] — adj. pertaining to biology. of or pertaining to the products and operations of applied biology: a biological test. —n. any substance, as a serum or vaccine, derived from animal products or other biological sources and used to treat or prevent disease. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: biological (Thesaurus) biolinguistics biological accumulation 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