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单词 etalon
释义

WordReference Random House Unabridged Dictionary of American English © 2024
e•ta•lon  (āt′l on′),USA pronunciation n. [Optics.]
  1. Opticsan interferometer consisting of two glass plates that reflect approximately half of each ray of light incident upon them and that are separated by a small, fixed distance: used to compare wavelengths and to study atomic spectra.
  • Gmc; see stall1
  • French; Middle French estalon standard, derivative of Old French estal place
  • 1900–05

Collins Concise English Dictionary © HarperCollins Publishers::
etalon /ˈɛtəˌlɒn/ n
  1. a device used in spectroscopy to measure wavelengths by interference effects produced by multiple reflections between parallel half-silvered glass or quartz plates
Etymology: 20th Century: French étalon a fixed standard of weights and measures, from Old French estalon; see also stallion
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