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Dobsonian telescope

[dob-soh-nee-uh n] /dɒbˈsoʊ ni ən/
noun
1.
a relatively inexpensive Newtonian telescope, suitable for visual but not photographic use, in which the tube assembly slips freely in the lower base.
Origin
after John Dobson, U.S. astronomer, its inventor; see -ian
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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