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Meaning of ischium

is•chi•um

Pronunciation: (is'kē-um), [key]
— pl. -chi•a
  1. the lower portion of either innominate bone. See diag. under
  2. either of the bones on which the body rests when sitting.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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