Ischion
Is´chi`on
n. | 1. | (Anat.) The ventral and posterior of the three principal bones composing either half of the pelvis; seat bone; the huckle bone. |
2. | (Zool.) One of the pleuræ of insects. |
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.