Chro‐nom″e‐ter (?), n. [Gr. � time + -meter: cf. F. chronomètre.] 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. (Mus.) 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.