Innominate bone

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noun, plural: innominate bones

Either of the two large bones of the pelvis, each made up of three large bones, the ilium, ischium, and pubis.


The innominate bone is made up of three parts, the ilium, ischium, and pubis. The three bones are distinct while young and fuse when adult.

The term innominate is used to designate parts that have not been named specifically.

Word origin: LL innōminātus, unnamed.

Synonym: coxal bone, hip bone.