/ Dictionary / Index B biological child: Meaning and Definition of Find definitions for: biolog'ical child' Pronunciation: [key] any child conceived rather than adopted by a specified parent, and therefore carrying genes from the parent. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. biological accumulation biological clock Related Content Daily Word Quiz: blanch Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language