any of several telescopes having as the objective a paraboloid mirror mounted at the lower end of the tube and using various systems of mirrors for viewing the image by reflecting the incident light to an eyepiece; reflector
See reflecting telescope in American Heritage Dictionary 4
(rĭ-flĕkˈtĭng)
noun
A telescope in which light from the object is gathered and focused by a concave mirror, with the resulting image magnified by the eyepiece.
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reflecting telescope
Newton's reflecting telescope; f indicates the focus