from the GNU version of the Collaborative International Dictionary of English
- adj. a form of reflecting telescope, named from Prof. James Gregory, of Edinburgh, who perfected it in 1663. A small concave mirror in the axis of this telescope, having its focus coincident with that of the large reflector, transmits the light received from the latter back through a hole in its center to the eyepiece placed behind it.
- n. a form of reflecting telescope. See under Gregorian.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a reflecting telescope that has a paraboloidal primary mirror and a hyperboloidal secondary mirror; light is brought to a focus through an aperture in the center of the primary mirror
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