[{"word":"f-number","phonetics":[],"meanings":[{"partOfSpeech":"noun","definitions":[{"definition":"The ratio of the focal length of a lens to its diameter; a measure of the light-gathering ability of the lens.","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/f-number"]}]