krəˈnäməd.ə(r), krō-, krä-, -ətə(r) noun
( -s )
Etymology: chron- + -meter
: an instrument for measuring time:
a. : a portable timepiece usually having a detent escapement and compensation balance and beating half seconds for keeping time where great accuracy is essential (as in determining longitude at sea) — called also box chronometer, marine chronometer
b. : a watch of great especially officially certified accuracy
c. obsolete : metronome