- renal c. in the embryo, a ring of veins around the aorta below the origin of the superior mesenteric artery.
* * *
col·lar 'käl-ər n a band (as of cotton) worn around the neck for therapeutic purposes (as protection, support, or retention of body heat)
* * *
col·lar (kolґər) an encircling band, generally around the neck.Medical dictionary. 2011.