[{"word":"myocardium","phonetics":[],"meanings":[{"partOfSpeech":"noun","definitions":[{"definition":"The muscular substance of the heart; the middle of the three layers forming the outer wall of the human heart.","synonyms":[],"antonyms":[]}],"synonyms":["cardiac muscle","heart muscle"],"antonyms":[]}],"license":{"name":"CC BY-SA 3.0","url":"https://creativecommons.org/licenses/by-sa/3.0"},"sourceUrls":["https://en.wiktionary.org/wiki/myocardium"]}]