noun, plural trigona [trahy-goh-nuh] . Anatomy.

1720–30; < Latin trigōnum triangle. See trigon Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

trigonum tri·go·num (trī-gō'nəm)
n. pl. tri·go·na (-nə)
A triangular anatomical area.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Potentially painful normal variants such as accessory navicular and os trigonum have been described.
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