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armillary sphere definition

ar·mil·lary sphere (är′mə ler′ē)

an ancient astronomical sighting instrument representing the great circles of the horizon, the ecliptic, the meridian, etc.

Etymology: < L armilla, armlet, bracelet < armus: see arm

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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