From Longman Dictionary of Contemporary Englishcircadiancir‧ca‧di‧an /sɜːˈkeɪdiən $ sɜːr-/ adjective [only before noun] technical TMCHBHrelating to a period of 24 hours, used especially when talking about changes in people’s bodies the body’s circadian rhythm
Examples from the Corpus
circadian• Lastly one may note the role played by the nervous system in controlling circadian behavioural patterns.• By early morning, per and timeless levels are once again very low, and the circadian cycle begins a new day.• The more regular your schedule, the easier it is to retrain your circadian rhythm in a twenty-four-hour time period.• To understand how exercise affects sleep, you must understand the circadian rhythm of the human body.• Body rhythm is known as the inner clock or circadian rhythm.• The timeslip had upset my circadian rhythms.• the body's circadian sleep-wake cycle• All blood samples were obtained between 0830 and 0930 h to keep to a minimum the spontaneous circadian variation of fibrinolytic system.• All rats were killed between 1400 and 1600 hours to prevent circadian variations.Origin circadian (1900-2000) Latin circa “around, about” + dies “day” 