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refractor

noun

Roget 445: optical instruments; lens, meniscus, magnifier, sunglass, magnifying glass, hand lens; microscope, megascope, tienoscope.    spectacles, specs [Coll.], glasses, barnacles, ... show more

Moby thesaurus: Cassegrainian telescope, Newtonian telescope, OAO, OSO, astronomical observatory, astronomical telescope, coelostat, coronagraph, coronograph, heliostat, observatory, orrery, planetarium, radar telescope, radio observatory, radio telescope, reflector, spectrograph, spectroheliograph, spectrohelioscope ... show more.

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