from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun An old astronomical model with solid, usually metal rings, all great circles of a single sphere, used to display relationships among the principal celestial circles.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun An instrument consisting of graduated metal circles used to represent the motions of
celestial bodiesaround the earth.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a celestial globe consisting of metal hoops; used by early astronomers to determine the positions of stars
from The American Heritage® Dictionary of the English Language, 4th Edition
[Translation of French sphère armillaire, from Latin armilla, bracelet, from armus, shoulder; see ar- in Indo-European roots.]
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