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2 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 conchoid
 蚌線; 螺線管; 螺旋線

From: Webster's Revised Unabridged Dictionary (1913)

 Con·choid n.  Geom. A curve, of the fourth degree, first made use of by the Greek geometer, Nicomedes, who invented it for the purpose of trisecting an angle and duplicating the cube.
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