[{"word":"melatonin","phonetic":"/ˌmɛləˈtoʊnɪn/","phonetics":[{"text":"/ˌmɛləˈtoʊnɪn/","audio":""}],"meanings":[{"partOfSpeech":"noun","definitions":[{"definition":"A hormone, related to serotonin, that is secreted by the pineal gland, and stimulates colour change in the skin of reptiles, and is involved in the sleep/wake and reproductive cycles in mammals","synonyms":[],"antonyms":[]},{"definition":"Any material similar in its chemistry and effect to the natural hormone.","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/melatonin"]}]