[{"word":"ultramafic","phonetics":[],"meanings":[{"partOfSpeech":"noun","definitions":[{"definition":"A rock with such properties.","synonyms":[],"antonyms":[]}],"synonyms":[],"antonyms":[]},{"partOfSpeech":"adjective","definitions":[{"definition":"Describing igneous rocks that contain magnesium and iron and only a very small amount of silica, such as are found in the Earth’s mantle.","synonyms":[],"antonyms":[]}],"synonyms":["ultrabasic"],"antonyms":[]}],"license":{"name":"CC BY-SA 3.0","url":"https://creativecommons.org/licenses/by-sa/3.0"},"sourceUrls":["https://en.wiktionary.org/wiki/ultramafic"]}]