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.
||Ar*mil"la (&?;), n.; pl. E. Armillas (&?;), L. Armillæ (&?;). [L., a bracelet.] 1. An armil.