ˈtrīˌgōn noun
( -s )
Etymology: French, literally, triangle, from Latin trigonum
1. also tri·gon -ˌgän : a triangular body part ; specifically : a smooth triangular area on the inner surface of the bladder limited by the apertures of the ureters and urethra
2. : a thickening of plant cell walls that occurs when three or more cells adjoin