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The Collaborative International Dictionary
Trigonid

Trigonid \Tri"go*nid\ [Webster 1913 Suppl.] Trigonal \Trig"o*nal\, a. Having three angles, or corners; triangular; as, a trigonal stem, one having tree prominent longitudinal angles.

Wiktionary
trigonid

n. The shearing end of a tribosphenic molar.