/ Dictionary / Index T triradius: Meaning and Definition of Find definitions for: tri•ra•di•us Pronunciation: (trī-rā'dē-us), [key] — pl. -di•i -di•us•es. a-shaped group of ridges on the palm of the hand at the base of each finger. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. triradiate Triratna Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language