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monochromator

[mon-uh-kroh-mey-ter] /ˌmɒn əˈkroʊ meɪ tər/
noun, Optics.
1.
a spectroscope with a slit that can be moved across the spectrum for viewing individual spectral bands.
Also called monochromatic illuminator.
Origin of monochromator
1905-1910
1905-10; monochromat(ic) + (illuminat)or
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for monochromator

monochromator

/ˌmɒnəʊˈkrəʊmeɪtə/
noun
1.
(physics) a device that isolates a single wavelength of radiation
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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