etalon - WordReference.com Dictionary of English

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  - estufa
  - esurient
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  - et cetera
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  - etagere
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etalon

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Concise Oxford English Dictionary © 2008 Oxford University Press:
etalon /ˈɛtəlɒn/

▶noun Physics a device consisting of two reflecting plates, for producing interfering light beams.

– origin early 20th cent.: from Fr. étalon, lit. ‘standard of measurement’.

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