[{"word":"tracer","phonetic":"/ˈtɹeɪsə(ɹ)/","phonetics":[{"text":"/ˈtɹeɪsə(ɹ)/","audio":""},{"text":"/ˈtɹeɪsɚ/","audio":""}],"meanings":[{"partOfSpeech":"noun","definitions":[{"definition":"A compound, element, or isotope used to track the progress or history of a natural process.","synonyms":[],"antonyms":[]},{"definition":"A round of ammunition for a firearm that contains magnesium or another flammable substance arranged such that it will burn and produce a visible trail when fired in the dark.","synonyms":["tracer ammunition","tracer bullet"],"antonyms":[]},{"definition":"The act or state of tracking or investigating something.","synonyms":[],"antonyms":[]},{"definition":"A request to trace the movements of a person or an object, such as a shipment.","synonyms":[],"antonyms":[]},{"definition":"A person who traces something.","synonyms":[],"antonyms":[]},{"definition":"A device or instrument used to assist in making tracings.","synonyms":[],"antonyms":[]}],"synonyms":["tracer ammunition","tracer bullet"],"antonyms":[]}],"license":{"name":"CC BY-SA 3.0","url":"https://creativecommons.org/licenses/by-sa/3.0"},"sourceUrls":["https://en.wiktionary.org/wiki/tracer"]}]