[{"word":"limestone","phonetic":"/ˈlaɪmstəʊn/","phonetics":[{"text":"/ˈlaɪmstəʊn/","audio":""},{"text":"/ˈlaɪmstoʊn/","audio":""}],"meanings":[{"partOfSpeech":"noun","definitions":[{"definition":"An abundant rock of marine and fresh-water sediments; primarily composed of calcite (CaCO3); it occurs in a variety of forms, both crystalline and amorphous.","synonyms":[],"antonyms":[]}],"synonyms":["calcium carbonate","lime"],"antonyms":[]},{"partOfSpeech":"adjective","definitions":[{"definition":"Made of or with limestone.","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/limestone"]}]