Emily Dickinson Lexicon

ARM'IL-LA-RY, a. [L. armilla, a bracelet, from armus, the arm.]

Resembling a bracelet, or ring; consisting of rings or circles. It is chiefly applied to an artificial sphere, composed of a number of circles of the mundane sphere, put together in their natural order, to assist in giving a just conception of the constitution of the heavens, and the motions of the celestial bodies. This artificial sphere revolves upon its axis within a horizon, divided into degrees, and movable every way upon a brass supporter. – Encyc.