Chronometer

1. n. A metronome.
2. n. An instrument for measuring time; a timekeeper.
3. n. 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.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.