circulus /cir·cu·lus/ (-lus) pl. cir´culi [L.] a circle.
cir·cu·lus (sûr ky -ls)n. pl. cir·cu·li (-l   ) 1. A ringlike or circular structure. 2. A circle formed by connecting arteries, veins, or nerves. |
circulus
see circle.
circulus arteriosus cerebri
the ring of arteries which serves as the major source of blood supply to the brain; a circle around the stalk of the pituitary gland ventral to thalamus; previously called circle of Willis.
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