noun armil an astronomical instrument indicating the recurrence of the equinoxes and solstices 3
noun armil (obsolete) A bracelet. 1
noun armil (Obsolete (No longer in use)) An ancient astronomical instrument, having either one ring placed in the plane of the equator for determining the time of the equinoxes (an equinoctial armil) or two or more rings, one in the plane of the meridian, for observing the solstices (a solstitial armil). 0
