Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- adjective Relating to or exhibiting approximately 24-hour periodicity.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective biology of, relating to, or showing
rhythmic behaviour with aperiod of 24 hours; especially of abiological process
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adjective of or relating to biological processes occurring at 24-hour intervals
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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The term circadian rhythms refers to biological cycles that repeat about every twenty-four hours.
Solve Your Child’s Sleep Problems M.D. Richard Ferber 2006
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The term circadian rhythms refers to biological cycles that repeat about every twenty-four hours.
Solve Your Child’s Sleep Problems M.D. Richard Ferber 2006
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So I think clearly what we call circadian rhythms, these oscillating clocks within the body, within cells in the body, clearly exist.
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"Circadian rhythms are the outward manifestation of an internal timing system which is driven by several genetic elements, what we call circadian clock genes."
Medindia Health News 2010
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There is also the change in circadian rythmns, as I go from being a gainfully employed American to a retired one.
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The word circadian is derived from the Latin circa diem or about a day and refers to the mysterious twenty-four-hour rhythms which control all brain outputs-behavioral, autonomic or neuro-endocrine-of all animals or humans who live on Earth with its twenty-four-hour alternation of light and darkness.
Space Michener, James 1982
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Sleep patterns in children and adults follow what is known as the circadian rhythm, which determines how easily we fall asleep, stay asleep, wake up in the morning and maintain a level of alertness during the day.
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Your body's clock, or body clock, is the time-keeping system inside you that controls your natural 24-hour sleep and wake cycle also known as your circadian rhythms.
Hyungsoo Kim: Is It Possible To Re-Set Your Biological Clock? Hyungsoo Kim 2011
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It is called a circadian rhythm and if it is out of sync you get that feeling of being "so tired but I can't sleep" or you fall asleep at 6 p.m. on the couch, wake at 2 a.m. and wonder what happened.
Dr. Michael J. Breus: Sleep Rituals: Training The Body And The Mind 2010
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Negative consequencesTeenager's biological rhythms - often referred to as their circadian rhythms - favor later bedtimes and later wake-up times.
seanahan commented on the word circadian
Interesting, the standard pronunciation really loses the etymology of circa-dian, around a day.
April 13, 2009