/ Dictionary / Index T trickle irrigation: Meaning and Definition of Find definitions for: trick'le irriga"tion. Pronunciation: [key] See drip irrigation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. trickle-down theory trick or treat Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language