[{"Bold_text": "noun", "List Items": ["a timepiece fitted with a recording device, as a stylus and rotating drum, used to mark the exact instant of an occurrence, especially in astronomy.", "a timepiece capable of measuring extremely brief intervals of time accurately, as a stopwatch able to record fractions of a second as well as elapsed time."]}, {"Bold_text": "verb (used with object)", "List Items": ["to time by means of a chronograph."]}]