a lamp consisting of an ultraviolet light source, as mercury vapor, contained in a fused-silica bulb that transmits ultraviolet light with little absorption.
[kwawrts] /kwɔrts/ noun 1. one of the commonest minerals, silicon dioxide, SiO 2 , having many varieties that differ in color, luster, etc., and occurring either in masses (as agate, bloodstone, chalcedony, jasper, etc.) or in crystals (as rock crystal, amethyst, citrine, etc.): the chief constituent of sand and sandstone, and an important constituent of […]
noun, Horology. 1. an extremely accurate electronic movement utilizing the natural frequency of vibrations of a quartz crystal to regulate the operation of the timepiece (quartz clock or quartz watch)
noun, Electronics. 1. a carefully cut quartz crystal that is piezoelectrically active. Compare (def 10).
[kwey-zahr, -zer, -sahr, -ser] /ˈkweɪ zɑr, -zər, -sɑr, -sər/ noun, Astronomy. 1. one of over a thousand known extragalactic objects, starlike in appearance and having spectra with characteristically large redshifts, that are thought to be the most distant and most luminous objects in the universe. /ˈkweɪzɑː; -sɑː/ noun 1. any of a class of extragalactic […]