Origin of ischium
Latin, hip joint, from Greek ischion
First Known Use: 1646
Medical Definition of ischium
plural ischia \-ə\play
: 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
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