The word 時辰儀 appears in documents from the Edo period.
時辰儀 was sometimes used as a translation for 'chronometer'.
The common loanword for 'chronometer', used instead of the rare 時辰儀.
A coined compound of 時 (time), 辰 (celestial stem/period), and 儀 (instrument). The exact historical derivation is uncertain; it is an obsolete term for a timepiece.