from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun astronomy A telescope, having a wide
field of view, comprising a thin aspheric lensand a large concave mirror
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun reflecting telescope that has plate that corrects for aberration so a wide area of sky can be photographed
from Wiktionary, Creative Commons Attribution/Share-Alike License
From Bernhard Schmidt German optician
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