Definition

Noun: An innate, internal mechanism in living organisms that regulates the rhythmic, periodic cycles of physiological functions and behaviors, such as sleep-wake cycles, hormone release, and reproductive timing.

Usage

The term "biological clock" is used to describe the internal timing system that governs an organism's daily (circadian), monthly, or seasonal rhythms. It is often discussed in contexts related to sleep, aging, and reproduction.

Examples

• Noun:
  • Traveling across time zones disrupts your biological clock, causing jet lag.
  • Many plants have a biological clock that tells them when to flower.
  • The concept of a woman's biological clock refers to the natural decline in fertility with age.

Advanced Usage

• "to reset/trick the biological clock": To alter one's internal rhythm, often through exposure to light at specific times or changes in routine.
  • Exposure to bright morning light can help reset your biological clock after a period of poor sleep.
• "to be governed/controlled by a biological clock": To have a function or behavior dictated by this internal timing mechanism.
  • The migration of birds is governed by a biological clock synchronized with the seasons.

Variants and Related Words

• Circadian rhythm (n): A roughly 24-hour cycle in the physiological processes of living beings, a primary function of the biological clock.
  • The sleep-wake cycle is a well-known circadian rhythm.
• Chronobiology (n): The field of biology that examines periodic (cyclic) phenomena in living organisms and their adaptation to solar- and lunar-related rhythms.
  • He studies chronobiology to understand sleep disorders.

Synonyms

• Internal clock: A more general, often interchangeable term for the biological clock.
• Body clock: A common, informal synonym.
• Endogenous rhythm: A technical term for an internally generated, self-sustaining rhythm.

Related Phrases

• Biological clock is ticking: An idiom specifically referring to the perceived pressure of declining fertility, especially concerning women and the desire to have children.
  • She felt her biological clock was ticking and started thinking seriously about starting a family.

Noun

1. an innate mechanism in living organisms that controls the periodicity of many physiological functions