Meaning & use
chronometer
A highly precise instrument for measuring time, especially one used for navigation or scientific purposes.
See it in a sentence
Sailors once relied on a marine chronometer to calculate their longitude at sea.
The watchmaker tested each chronometer against an atomic clock before certifying its accuracy.
A note on using this word
Chronometer usually implies exceptional precision, unlike an ordinary watch or clock.
Words with a similar meaning
timepiece
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