Etymology
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chronometer (n.)

"any instrument that measures time or divides it into equal portions," especially "a time-keeper of great accuracy," 1735, from chrono- "time" + -meter. Related: Chronometric; chronometry.

updated on November 17, 2017

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Definitions of chronometer from WordNet

chronometer (n.)
an accurate clock (especially used in navigation);
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.