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trigonid in Medicine

trigonid

(trīgə-nĭd, trī-gŏnĭd)
n.
  1. The first three dominant cusps of a lower molar tooth.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.