[kruh-nom-i-ter] /krəˈnɒm ɪ tər/

a timepiece or timing device with a special mechanism for ensuring and adjusting its accuracy, for use in determining longitude at sea or for any purpose where very exact measurement of time is required.
any timepiece, especially a wristwatch, designed for the highest accuracy.
a timepiece designed to be accurate in all conditions of temperature, pressure, etc, used esp at sea

1735, from chrono- “time” + -meter. Related: Chronometric.
An extremely accurate clock or other timepiece. Chronometers are used in scientific experiments, navigation, and astronomical observations. It was the invention of a chronometer capable of being used aboard ship, in 1762, that allowed navigators for the first time to accurately determine their longitude at sea.


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