Dobsonian telescope

[dob-soh-nee-uh n]
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 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