Tri"gon (?), n. (Zoöl.)
The cutting region of the crown of an upper molar, usually the
anterior part. That of a lower molar is the Tri"go*nid
(?).
Tri"gon (?), n. [L. trigonum, Gr. ?;
? (see Tri-) + ? a corner, angle: cf. F. trigone.]
1. A figure having three angles; a
triangle.
2. (Astrol.) (a) A division
consisting of three signs. (b) Trine, an aspect
of two planets distant 120 degrees from each other.
Hutton.
3. (Gr. & Rom. Antiq.) (a) A
kind of triangular lyre or harp. (b) A kind of
game at ball played by three persons standing at the angular points of a
triangle.