Definition of chronometer
: timepiece I don't know about you, but by the time the short fat hand of my analog chronometer is on the six, I'm about ready to take the rest of the day off.— Stanley Bing especially : one designed to keep time with great accuracy despite external forces Self-educated English clockmaker John Harrison (1693-1776) found the answer by inventing a chronometer—a friction-free timepiece, impervious to pitch and roll, temperature and humidity—that would carry the true time from the home port to any destination. — Genevieve Stuttaford
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