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From: MDBG CC-CEDICT Chinese-English Dictionary 漢英字典

 弦切角 [ㄒㄧㄢˊ ㄑㄧㄝ ㄐㄧㄠˇ; xian2 qie1 jiao3]
 chord angle (i.e. angle a chord of a curve makes to the tangent)