American Heritage® Dictionary of the English Language, Fourth Edition
- n. A telescope in which light from the object is gathered and focused by a concave mirror, with the resulting image magnified by the eyepiece.
- n. A telescope which produces a magnified image by reflecting light through a series of mirrors housed in a tube, using a large curved mirror to gather the light and one or more additional mirrors to transmit the light to an eyepiece.
GNU Webster's 1913
- adj. See under Telescope.
- n. a telescope in which the image is formed by a speculum or mirror (or usually by two speculums, a large one at the lower end of the telescope, and the smaller one near the open end) instead of an object glass. See Gregorian, Cassegrainian, Herschelian, and Newtonian, telescopes, above.
- n. optical telescope consisting of a large concave mirror that produces an image that is magnified by the eyepiece
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