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armillary sphere
(är′mə ler′ē)
an ancient astronomical sighting instrument representing the great circles of the horizon, the ecliptic, the meridian, etc.
Origin: < L armilla, armlet, bracelet < armus: see arm
See armillary sphere in American Heritage Dictionary 4
noun
An old astronomical model with solid rings, all circles of a single sphere, used to display relationships among the principal celestial circles.
Origin:
Origin: Translation of French sphère armillaire
Origin: , from Latin armilla, bracelet
Origin: , from armus, shoulder; see ar- in Indo-European roots
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