ARMIL

Ar″mil (�), n. [[L. armilla a bracelet, fr. armus arm: cf. OF. armille.]] 1. 1. A bracelet.
2. 2. An ancient astronomical instrument.
☞ When composed of one ring placed in the plane of the equator for determining the time of the equinoxes, it is called an equinoctial armil; when of two or more rings, one in the plane of the meridian, for observing the solstices, it is called a solstitial armil. Whewell.