Etymology

etalon

E1T1A1L1O1N1

Today it means: An optical device containing parallel mirrors, used as a narrow band filter, often in laser design. Full definition →

French étalon
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The story

  1. French · borrowed frométalon
  2. French · borrowed frométalon
  3. English todayetalon

Borrowed from French étalon (“measuring gauge, standard”).

Etymology from Wiktionary, CC BY-SA 4.0.