Pronunciation: (trī'gōn), [key]
1. Also,trigonum. Anat.
a. a triangular part or area.
b. the area on the floor of the urinary bladder between the opening of the urethra in front and the two ureters at the sides.
2. Bot.a thickened area where three or more plant cells come together.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.