chronometer

chronometer is a   Noun

Definition:

[1] An instrument for measuring time; a timekeeper.

[2] A portable timekeeper, with a heavy compensation balance, and usually beating half seconds; -- intended to keep time with great accuracy for use an astronomical observations, in determining longitude, etc.

[3] A metronome. Box chronometer. See under Box. -- Pocket chronometer, a chronometer in the form of a large watch. -- To rate a chronometer. See Rate, v. t.

Synonyms: