/ Dictionary / Index T Triangulum: Meaning and Definition of Find definitions for: Tri•an•gu•lum Pronunciation: (trī-ang'gyu-lum), [key] — -li the Triangle, a northern constellation between Pisces and Perseus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: triangulum (Thesaurus) triangulation Triangulum Australe Related Content Daily Word Quiz: reclusive Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language