Achromatic telescope

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one in which the chromatic aberration is corrected, usually by means of a compound or achromatic object glass, and which gives images free from extraneous color.
See under Achromatic.

See also: Achromatic, Telescope

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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References in periodicals archive ?
Messier then switched to an "achromatic telescope of V-h feet [focal length] with a triple objective, made in London by Dollond," to time the Io eclipse (it began at 5:53 a.m.).
In 1824 the world's largest achromatic telescope of that time was installed and Friedrich von Struve started further observations from Tartu.
five' telescope, a 2%-inch achromatic telescope with stand; one terrestrial eyepiece and three astronomical eyepieces: 'Annual report of the Council', MNRAS 37(4), (1877 February).