Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Etalon" Definition
noun
An optical device containing parallel mirrors, used in laser design to delay light.
Source: Wiktionary
Prototype, standard.
Source: Wiktionary
A device consisting of two reflecting glass plates, employed for measuring small differences in the wavelength of light using the interference it produces.
Source: Oxford Dictionary
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