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  1. Oxford Dictionary

    Gregorian telescope

    • IPA[ɡrɪˈɡɔːrɪən]

    英式

    • n.
      an early reflecting telescope in which light reflected from a concave elliptical secondary mirror passes through a hole in the primary mirror. It was rendered obsolete by the introduction of Newtonian and Cassegrain telescopes.

    • noun: Gregorian telescope, plural noun: Gregorian telescopes