co·se·cant /(ˌ)koˈsiˌkænt, kənt/
  余割
  Co·se·cant n.  Trig. The secant of the complement of an arc or angle. See Illust. of Functions.
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  cosecant
       n : ratio of the hypotenuse to the opposite side of a
           right-angled triangle [syn: cosec]