a plane figure with three straight sides and three angles 三角形 an equilateral triangle. 等边三角形。 ■a thing shaped like such a figure 三角形物 a small triangle of grass. 一小块三角形草地。 ■a situation involving three people or things, especially an emotional relationship involving a couple and a third person with whom one of them is involved (尤指情感上的)三角关系 ■a musical instrument consisting of a steel rod bent into a triangle and sounded by being struck with a small steel rod 三角铁(打击乐器) ■a frame used to position the pool balls in snooker and pool (摆放斯诺克和落袋台球撞球位置的)三角框 ■(N. Amer.)a drawing instrument in the form of a right-angled triangle (北美)直角三角形三角板(绘图用具) ■(triangles)(historical)a frame of three halberds joined at the top to which a soldier was bound for flogging (史)(系缚士兵以鞭打的)三戟刑具
a small brownish Eurasian moth of oak and beech woods 小型欧亚紫刺蛾(呈棕色,见于橡木及山毛榉林)
Heterogenea asella, family Limacodidae 拉丁名Heterogenea asella,刺蛾科
语源
late Middle English: from Old French triangle or Latin triangulum, neuter of triangulus 'three-cornered' (see tri-, angle)