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monochromator

[mon-uh-kroh-mey-ter]
noun Optics.
  1. a spectroscope with a slit that can be moved across the spectrum for viewing individual spectral bands.
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Origin of monochromator

First recorded in 1905–10; monochromat(ic) + (illuminat)or
Also called monochromatic illuminator.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for monochromator

monochromator

noun
  1. physics a device that isolates a single wavelength of radiation
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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