ISCHION

{ ‖Is″chi‐on (?), ‖Is″chi‐um (?), } n. [[L., Gr. ισχἴον.]] 1. 1. (Anat.) The ventral and posterior of the three principal bones composing either half of the pelvis; seat bone; the huckle bone.
2. 2. (Zoöl.) One of the pleuræ of insects.