Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The study of the effects of time and rhythmical phenomena on life processes.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun biology The study of the effects of time on biological systems, especially the effects of periodicity

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Ancient Greek χρόνος (chrónos) "time" and biology.

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