n. 三角形, 三角竖琴

Trigon \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.

4. (Zo["o]l.) The cutting region of the crown of an upper
molar, usually the anterior part. That of a lower molar is
the