Longman Dictionary of Contemporary English
The Collaborative International Dictionary
Douglas Harper's Etymology Dictionary
Wiktionary
a. (context biology English) of, relating to, or showing rhythmic behaviour with a period of 24 hours; especially of a biological process
WordNet
adj. of or relating to biological processes occurring at 24-hour intervals; "circadian rhythms"
Wikipedia
- Redirect Circadian rhythm
Circadian is a concept album and the first full-length studio album by 5th Projekt. It was released on August 29, 2006 on 5th Projekt's Organik Rekords. It explores the metaphysical relationship of humanity as it coexists with its environment and the cycles of which both partake and create. Music and lyrics were written by Tara Rice and/or Sködt D. McNalty.
Usage examples of "circadian".
Simulated Artefact lacks circadian rhythms and is indifferent to night or day.
The mission was terminated after eight and one half days of a planned three-week mission because telemetry indicated Bonnie was seriously ill, afflicted by such unusual troubles as loss of circadian rhythm, rapid changes from one to another of the four normal levels of sleep, and pendular eye movementabnormal swinging from side to side.
The conductor for this symphony is the circadian pacemaker, a neural cluster of thousands of clock cells in the brain, themselves synchronized into a coherent unit.
In addition to the circadian rhythm, we also have an ultradian rhythm.
At this higher level, scientists have recently discovered cryptic regularities in the timing of human sleep-wake cycles and other circadian rhythms, even though the microscopic basis for these laws remains enigmatic.
The circadian rhythm, the daily cycling of physiological function, is known to go back at least to animals as humble as mollusks.
A far cry from the normal terrestrial circadian rhythm, and one that had helped to poison quite a few of the early attempts at interspecies cooperation.
I think we need circadian rhythms maintained as long as we can possibly manage it.
Well, how out of whack could their circadian rhythms get their second night on the Moon?
Which made it a lot easier for them to adapt to other planets than it was for humans with their long circadian rhythms, Hebo thought for perhaps the thousandth time.
His circadian rhythm was the least of the personal rhythms that had been scrambled.
You can still find claims that time dilation applies to watches and elementary particles-and, presumably, to circadian and other rhythms in plants, animals, and microbes-but not to human biological clocks.
Of course, they could establish over that period of time a circadian rhythm coincident with the Mars day of 24 hours and 37 minutes, but the slight advantage of achieving this would scarcely repay the effort.
He slept deeply again, refreshed by the timeslip in every day, a little slack in the circadian rhythm, the body's own time off.
His circadian rhythm is set for a duty shift that begins later on.