Ischium definitions

ĭs'kē-əm
The lowest of the three major bones that constitute each half of the pelvis.
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The lowermost of the three sections of the innominate bone; bone on which the body rests when sitting.
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The lowest of the three major bones that constitute each half of the pelvis.
noun
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The lowest of the three major bones that constitute each half of the pelvis, distinct at birth but later becoming fused with the ilium and pubis.
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(anatomy) The lowest of the three bones that make up each side of the pelvis. [from 17th c.]
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Origin of ischium

From Latin ischium, from Ancient Greek ἰσχίον (iskhion, “hip joint”).