Är'mil-la-ry, a.

a. [L. Lat. armillarius, from Lat. armilla, arm ring, bracelet, from armus, arm; Fr. armillaire. See ARM, n.] Pertaining to, or resembling, a bracelet or ring; consisting of rings or circles.

Armillary sphere, an instrument consisting of several brass rings, all circles of the same sphere, designed to represent the position which belongs to the important circles of the celestial sphere. Nichol.