The Collaborative International Dictionary of English v.0.48:
Innominate \In*nom"i*nate\, a. [L. innominatus; pref. in- not +
nominare to name.]
1. Having no name; unnamed; as, an innominate person or
place. [R.] --Ray.
2. (Anat.) A term used in designating many parts otherwise
unnamed; as, the innominate artery, a great branch of the
arch of the aorta; the innominate vein, a great branch of
the superior vena cava.
Innominate bone (Anat.), the great bone which makes a
lateral half of the pelvis in mammals; hip bone; haunch
bone; huckle bone. It is composed of three bones, ilium,
ischium, and pubis, consolidated into one in the adult,
though separate in the fetus, as also in many adult
reptiles and amphibians.
Innominate contracts (Law), in the Roman law, contracts
without a specific name.