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Meaning of circadian

cir•ca•di•an

Pronunciation: (sûr-kā'dē-un, -kad'ē-, sûr"ku-dē'un), [key]
— adj.
  1. noting or pertaining to rhythmic biological cycles recurring at approximately 24-hour intervals.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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