Origin and Etymology of ischium
Latin, hip joint, from Greek ischion
First Known Use: 1646
Medical Definition of ischium
: the dorsal and posterior of the three principal bones composing either half of the pelvis consisting in humans of a thick portion, a large rough eminence on which the body rests when sitting, and a forwardly directed ramus which joins that of the pubis
Seen and Heard
What made you want to look up ischium? Please tell us where you read or heard it (including the quote, if possible).