Ischion

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

2. (Zoöl.) One of the pleuræ of insects.