• synonyms


  1. Also trigonum. Anatomy.
    1. a triangular part or area.
    2. 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. Botany. a thickened area where three or more plant cells come together.
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Origin of trigone

1825–35; < French < Latin trigōnum triangle; see trigon
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for trigone

Historical Examples of trigone

  • The trigone was covered by a mass consisting of pointed papill.

    Scientific American Supplement, No. 648, June 2, 1888.


  • On the left side of the trigone a tumor with a broad base was seen, which resembled somewhat a strawberry in size and form.

trigone in Medicine


  1. A triangle or trigonum.
  2. The first three dominant cusps of an upper molar tooth.
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Related formstri•gonal adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.