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

 對頂角 [ㄉㄨㄟˋ ㄉㄧㄥˇ ㄐㄧㄠˇ; dui4 ding3 jiao3]
 angle to the vertical
 angle (between two lines or two planes)
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