[ad_1] noun, plural ar·mil·lae [ahr-mil-ee, -mil-ahy] /ɑrˈmɪl i, -ˈmɪl aɪ/, ar·mil·las. armill. n.1706, Latin, literally "bracelet, armlet, arm ring," from armus "shoulder, upper arm" (see arm (n.1)). Related: Armillary. [ad_2]