Astron.
an ancient instrument consisting of an arrangement of rings, all of which are circles of the same sphere, used to show the relative positions of the celestial equator, ecliptic, and other circles on the celestial sphere.
[ 1550-60 ]
ARMILLARY SPHERE
Meaning of ARMILLARY SPHERE in English
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012