The ilium is the scientific name for the hip bone or pelvis
bone. The ilium is a butterfly-shaped bone, and the ilium crest is
the hipbone.
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The ilium is one of the three bones that form the coxal bone.
''Iliac'' is an adjective meaning ''relative to the ilium''. Thus
the iliac bone is the same as the ilium.
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The ilium is the uppermost and largest bone of the pelvis, and appears in most vertebrates including mammals and birds, but not bony fish.