DICT.TW Dictionary Taiwan

 incurvation
 內曲,彎曲

 In·cur·va·tion n.
 1. The act of bending, or curving.
 2. The state of being bent or curved; curvature.
    An incurvation of the rays.   --Derham.
 3. The act of bowing, or bending the body, in respect or reverence. “The incurvations of the knee.”
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 incurvation
      n 1: a shape that curves or bends inward [syn: concave shape, concavity,
            incurvature]
      2: the action of creating a curved shape