An instrument other than a watch for measuring or indicating time, especially a mechanical or electronic device having a numbered dial and moving hands or a digital display.
A time clock.
A source of regularly occurring pulses used to measure the passage of time, as in a computer.
Any of various devices that indicate measurement, such as a speedometer or a taximeter.
A biological clock.
Botany The downy flower head of a dandelion that has gone to seed.
v.
clocked, clock·ing, clocks
v.
tr.
To time, as with a stopwatch: clock a runner.
To register or record with a mechanical device: clocked the winds at 60 miles per hour.
v.
intr. To record working hours with a time clock: clocks in at 8 A.M. and out at 4 P.M.
[Middle English clokke, from Old North French cloque, bell, or from Middle Dutch clocke, bell, clock, both from Medieval Latin clocca, of imitative origin.] clock'er n.