/ Dictionary / Index T tick trefoil: Meaning and Definition of Find definitions for: tick' tre'foil Pronunciation: [key] any of numerous plants belonging to the genus Desmodium, of the legume family, having trifoliolate leaves and jointed pods with hooked hairs by which they adhere to objects. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ticktock ticky-tacky Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language