internal clock

noun

Definition of internal clock

1 : a system in the body that controls when a person needs to sleep, eat, etc. The long trip upset my internal clock and I had a hard time getting to sleep.
2 : a clock or timing device that is inside a computer

Comments on internal clock

What made you want to look up internal clock? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

one from the Upper Peninsula of Michigan

Get Word of the Day daily email!

Test Your Vocabulary

Musical Words Quiz

  • gramophone
  • Which word describes a musical performance marked by the absence of instrumental accompaniment?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!