trigonidn.

/ˈtrɪɡənɪd/

Etymology: < trigon n. + -id suffix¹ (arbitrarily used).

Comparative Anatomy.

The triangle of cusps of the lower molar teeth in primitive mammals.

ΚΠ

1897 H. F. Osborn in Amer. Naturalist Dec. 1002 Our studies among the Mesozoic mammals have left no doubt that the upper and lower triangles, or ‘trigon’ and ‘trigonid’, were derived from the reptilian protocone by the addition of lateral cusps... The ‘trigon’ was essentially a cutting apparatus, so perfect that many mammals retained it without further evolution.

This entry has not yet been fully updated (first published 1914; most recently modified version published online September 2018).

单词	trigonid
释义	trigonidn. /ˈtrɪɡənɪd/ Etymology: < trigon n. + -id suffix¹ (arbitrarily used). Comparative Anatomy. The triangle of cusps of the lower molar teeth in primitive mammals. ΚΠ 1897 H. F. Osborn in Amer. Naturalist Dec. 1002 Our studies among the Mesozoic mammals have left no doubt that the upper and lower triangles, or ‘trigon’ and ‘trigonid’, were derived from the reptilian protocone by the addition of lateral cusps... The ‘trigon’ was essentially a cutting apparatus, so perfect that many mammals retained it without further evolution. This entry has not yet been fully updated (first published 1914; most recently modified version published online September 2018). < n.1897
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