[{"word":"hafnium","phonetic":"/ˈhæfniəm/","phonetics":[{"text":"/ˈhæfniəm/","audio":""}],"meanings":[{"partOfSpeech":"noun","definitions":[{"definition":"A chemical element (symbol Hf) with an atomic number of 72: a lustrous, silvery-grey tetravalent transition metal.","synonyms":[],"antonyms":[]}],"synonyms":["celtium"],"antonyms":[]}],"license":{"name":"CC BY-SA 3.0","url":"https://creativecommons.org/licenses/by-sa/3.0"},"sourceUrls":["https://en.wiktionary.org/wiki/hafnium"]}]