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Dobsonian telescope

[dob-soh-nee-uh n]
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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.
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Origin of Dobsonian telescope

after John Dobson, U.S. astronomer, its inventor; see -ian
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018