internal clock

noun

1. biological clock.

Word History and Origins

Origin of internal clock¹

First recorded in 1955–60

Example Sentences

You really have to be thoughtful of your act structures and that internal clock.

From Salon

The theory behind time-restricted eating is that it supports the circadian rhythm, or the body’s internal clock.

From Seattle Times

They discovered that disruption of the internal clock in the epithelial cells lining the intestine alters secretion of cytokine proteins, leading to heightened inflammation, increased numbers of immunosuppressive myeloid cells and cancer progression.

From Science Daily

Surprisingly, they found that the daily internal clock worked perfectly fine in all specimens, even the arrhythmic "couch potatoes," and that the number of genes with rhythmic activity was nearly as high as in the "punctual" worms.

From Science Daily

This can disrupt the 24-hour internal clock in people and impair sleep.

From Science Daily