NEWTONIAN • DICTIONARY ONE.COM • Definition of Newtonian

... glass, convex lens, concave lens, convexo-concave lens[obs3], coated lens, multiple lens, compound lens, lens system, telephoto lens, wide-angle lens, fish-eye lens, zoom lens; optical bench. astronomical telescope, reflecting telescope, reflector, refracting telescope, refractor, Newtonian telescope, folded-path telescope, finder telescope, chromatoscope; X-ray telescope; radiotelescope, phased-array telescope, Very Large Array radiotelescope; ultraviolet telescope; infrared telescope; star spectroscope; space telescope. [telescope mounts] altazimuth ...

— Roget's Thesaurus