Usually means: Internal mechanism regulating physiological processes.
Definitions Related words Mentions
We found 26 dictionaries that define the word biological clock:

General (17 matching dictionaries)
  1. biological clock: Merriam-Webster
  2. biological clock: Oxford Learner's Dictionaries
  3. biological clock: American Heritage Dictionary of the English Language
  4. biological clock: Collins English Dictionary
  5. biological clock: Vocabulary.com
  6. biological clock: Cambridge Advanced Learner's Dictionary
  7. biological clock: Wiktionary
  8. biological clock: Infoplease Dictionary
  9. biological clock: Dictionary.com
  10. Biological clock (aging), Biological clock: Wikipedia, the Free Encyclopedia
  11. biological clock: Rhymezone
  12. biological clock: FreeDictionary.org
  13. biological clock: Mnemonic Dictionary
  14. biological clock: TheFreeDictionary.com
  15. biological clock: Longman Dictionary of Contemporary English

Computing (1 matching dictionary)
  1. biological clock: Encyclopedia

Medicine (5 matching dictionaries)
  1. biological clock: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. online medical dictionary (No longer online)
  4. Sleep Terms (No longer online)
  5. Biological clock: Medical dictionary

Science (2 matching dictionaries)
  1. Bird On! (No longer online)
  2. Botanical Terms (No longer online)

Slang (1 matching dictionary)
  1. biological clock: Urban Dictionary

(Note: See biological_clocks as well.)

Definitions from Wiktionary (biological clock)

noun:  (biology) Any of several mechanisms that regulate the periodicity of biological functions, such as the circadian rhythm.
noun:  (figuratively) A notional clock to which people should pay attention, lest menopause or andropause kicks in and it is too late for them to have children.

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