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