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