from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A device that rotates a telescope so as to keep its orientation constant with relation to the stars.
from the GNU version of the Collaborative International Dictionary of English
- n. an optical instrument used to follow the path of a celestial body and reflect its light into a telescope; it has a movable and a fixed mirror.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. optical device used to follow the path of a celestial body and reflect its light into a telescope; has a movable and a fixed mirror
Related to Latin coelestis ("sky"), corrupted form of caelestis. (Wiktionary)