"circadian rhythm." YourDictionary, n.d. Web. 13 October 2018. <http://www.yourdictionary.com/circadian-rhythm>.
circadian rhythm. (n.d.). Retrieved October 13th, 2018, from http://www.yourdictionary.com/circadian-rhythm
(plural circadian rhythms)
From the Latin circa, meaning "around" and dies, "day", meaning literally, "around a day".
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