[{"word":"isochrons","phonetics":[],"meanings":[{"partOfSpeech":"noun","definitions":[{"definition":"A line on a chart linking rock of the same age (especially as measured using the ratios of lead isotopes)","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/isochron","https://en.wiktionary.org/wiki/isochrons"]}]