[{"word":"antiknock","phonetics":[],"meanings":[{"partOfSpeech":"noun","definitions":[{"definition":"Such a substance, usually tetraethyl lead (also MMT, MTBE and ethanol)","synonyms":[],"antonyms":[]}],"synonyms":[],"antonyms":[]},{"partOfSpeech":"adjective","definitions":[{"definition":"Of an additive added to petroleum/gasoline to reduce the occurrence of engine knock.","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/antiknock"]}]