circadian Hear it!

circadian definition

cir·ca·dian (sər kā′dē ən, sʉr′kə dē′ən)

adjective

Biol. designating or of behavioral or physiological rhythms associated with the 24-hour cycles of the earth's rotation, as, in man, the regular metabolic, glandular, and sleep rhythms which may persist through a dislocation of day and night caused by high-speed travel

Etymology: coined < L circa, about + diem, acc. sing. of dies, day: see deity

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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