from the GNU version of the Collaborative International Dictionary of English
- n. a reflecting telescope of the form invented by Sir William Herschel, in which only one speculum is employed, by means of which an image of the object is formed near one side of the open end of the tube, and to this the eyeglass is applied directly.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a reflecting telescope with the mirror slightly tilted to throw the image to the side where it can be viewed
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