ISCHIUM
ischium, ischial bone, os ischii
(noun) one of the three sections of the hipbone; situated below the ilium
Source: WordNet® 3.1
Etymology
Noun
ischium (plural ischia)
(skeleton) The lowest of the three bones that make up each side of the pelvis. [from 17th c.]
Coordinate terms
• ilium
• pubis
Source: Wiktionary
Is"chi*on, Is"chi*um, n. Etym: [L., Gr.
1. (Anat.)
Definition: The ventral and posterior of the three principal bones
composing either half of the pelvis; seat bone; the huckle bone.
2. (Zoöl.)
Definition: One of the pleuræ of insects.
Source: Webster’s Unabridged Dictionary 1913 Edition