monochromator

[ mon-uh-kroh-mey-ter ]
/ ˌmɒn əˈkroʊ meɪ tər /

noun Optics.

a spectroscope with a slit that can be moved across the spectrum for viewing individual spectral bands.

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Also called monochromatic illuminator.

Origin of monochromator

First recorded in 1905–10; monochromat(ic) + (illuminat)or
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for monochromator

monochromator
/ (ˌmɒnəʊˈkrəʊmeɪtə) /

noun

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