Armillary comes from the Latin word armill(a), “bracelet, hoop,” which is typically worn on the arm.
The Latin word armill(a) was formed from the Latin word arm(us), meaning “shoulder,” and the diminutive suffix –illa.
Armillary is most often used in the term armillary sphere, “an ancient instrument consisting of an arrangement of rings used to show the relative positions of the celestial equator, ecliptic, and other circles on the celestial sphere.”
EXAMPLES OF ARMILLARY
As I studied the antique armillary sundial, I marveled at the elegant combination of delicate rings that allowed for precise timekeeping.
The museum displayed a stunning armillary globe, its metal rings forming a three-dimensional representation of the celestial sphere.