[{"word":"testcard","phonetics":[],"meanings":[{"partOfSpeech":"noun","definitions":[{"definition":"(optometry) A card printed with various letters or symbols, used in testing vision.","synonyms":[],"antonyms":[]},{"definition":"A test signal, typically broadcast at times when the transmitter is active but no programme is being broadcast (often at startup and closedown).","synonyms":[],"antonyms":[]}],"synonyms":["Snellen chart","test pattern"],"antonyms":[]}],"license":{"name":"CC BY-SA 3.0","url":"https://creativecommons.org/licenses/by-sa/3.0"},"sourceUrls":["https://en.wiktionary.org/wiki/test%20card","https://en.wiktionary.org/wiki/testcard"]}]