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Dobsonian telescope

American

[dob-soh-nee-uhn] / dɒbˈsoʊ ni ən /

noun

a relatively inexpensive Newtonian telescope, suitable for visual but not photographic use, in which the tube assembly slips freely in the lower base.

After John Dobson, U.S. astronomer, its inventor; see -ian

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023