n.

[L. armilla a bracelet, fr. armus arm: cf. OF. armille.]

1. A bracelet. [Obs.]

2. An ancient astronomical instrument.

Note: 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.

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[see next]  1) bracelet
2) an ancient astronomical instrument for determining equinoxes and solstices by the shadows cast by the sun