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triangle

triangle definition

tri·angle (trī′aŋ′gəl)

noun

a geometric figure having three angles and three sides
any three-sided or three-cornered figure, area, object, part, etc.
a right-angled, flat, triangular instrument used in drawing geometric figures
a situation involving three persons, esp. when one person is having love affairs with two others
a musical percussion instrument consisting of a steel rod bent into a triangle with one angle open: it produces a high-pitched, tinkling sound when struck with a short steel rod

Etymology: ME < MFr < L triangulum: see tri- & angle

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.