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From: Webster's Revised Unabridged Dictionary (1913)

 Ar·mil n.
 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.
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