/ Dictionary / Index A attenuant: Meaning and Definition of Find definitions for: at•ten•u•ant Pronunciation: (u-ten'y-unt), [key] — n. a medicine or agent that thins the blood. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. attentive attenuate Related Content Daily Word Quiz: wary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language