/ Dictionary / Index B biological control: Meaning and Definition of Find definitions for: biolog'ical control' Pronunciation: [key] the control of pests by interference with their ecological status, as by introducing a natural enemy or a pathogen into the environment. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. biological clock biological engineering Related Content Daily Word Quiz: ablution Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language