Pronunciation: (trī-ang'gyu-lur), [key]
1. pertaining to or having the form of a triangle; three-cornered.
2. having a triangle as base or cross section: a triangular prism.
3. comprising three parts or elements; triple.
4. pertaining to or involving a group of three, as three persons, parties, or things.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.