Definition of internal clock
- The long trip upset my internal clock and I had a hard time getting to sleep.
: existing or situated within the limits or surface of something: such as
: situated near the inside of the body
: situated on the side toward the median plane of the body
: a device other than a watch for indicating or measuring time commonly by means of hands moving on a dial
: a registering device usually with a dial
: time clock
: to time with a stopwatch or by an electric timing device
: to be timed at
: to register on a mechanical recording device
: an ornamental figure on the ankle or side of a stocking or sock
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