[{"word":"invar","phonetics":[],"meanings":[{"partOfSpeech":"noun","definitions":[{"definition":"An alloy of iron containing 35.5% nickel, and having a very low coefficient of expansion.","synonyms":[],"antonyms":[]}],"synonyms":[],"antonyms":[]}],"license":{"name":"CC BY-SA 3.0","url":"https://creativecommons.org/licenses/by-sa/3.0"},"sourceUrls":["https://en.wiktionary.org/wiki/invar"]}]