[{"word":"etalons","phonetics":[],"meanings":[{"partOfSpeech":"noun","definitions":[{"definition":"An optical device containing parallel mirrors, used as a narrow band filter, often in laser design.","synonyms":[],"antonyms":[]}],"synonyms":["Fabry-Pérot interferometer"],"antonyms":[]}],"license":{"name":"CC BY-SA 3.0","url":"https://creativecommons.org/licenses/by-sa/3.0"},"sourceUrls":["https://en.wiktionary.org/wiki/etalon","https://en.wiktionary.org/wiki/etalons"]}]