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An optical telescope.


tele- +‎ -scope. From Latin telescopium, from Ancient Greek τηλεσκόπος ‎(tēleskópos, far-seeing), from τῆλε ‎(têle, afar) + σκοπέω ‎(skopéō, I look at).

Coined in 1611 by the Greek mathematician Giovanni Demisiani for one of Galileo Galilei's instruments presented at a banquet at the Accademia dei Lincei.


  • (UK) IPA(key): /ˈtɛlɪskəʊp/
  • (US) IPA(key): /ˈtɛləˌskoʊp/
  • (file)
  • Hyphenation: tele‧scope


telescope ‎(plural telescopes)

  1. A monocular optical instrument possessing magnification for observing distant objects, especially in astronomy.
  2. Any instrument used in astronomy for observing distant objects (such as a radio telescope).

Derived terms[edit]



telescope ‎(third-person singular simple present telescopes, present participle telescoping, simple past and past participle telescoped)

  1. To extend or contract in the manner of a telescope.
  2. To slide or pass one within another, after the manner of the sections of a small telescope or spyglass.
  3. To come into collision, as railway cars, in such a manner that one runs into another.

See also[edit]