/ˈtraɪæŋgl ||; ˈtraɪˌæŋgḷ/noun[C] 1 a shape that has three straight sides 三角形: a right-angled triangle 直角三角形
2 a metal musical instrument in the shape of a triangle that you play by hitting it with a metal stick 三角铁（一种打击乐器） ☞picture at music 见music插图