Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- adj. Biology Relating to or exhibiting approximately 24-hour periodicity.
Wiktionary
- adj. biology of, relating to, or showing rhythmic behaviour with a period of 24 hours; especially of a biological process
WordNet 3.0
- adj. of or relating to biological processes occurring at 24-hour intervals
Etymologies
- From Latin circā ("about") and diēs ("a day") with the English suffix -an. (Wiktionary)
- Latin circā, around; see circa + Latin diēs, day. (American Heritage® Dictionary of the English Language, Fourth Edition)
Examples
“The term circadian rhythms refers to biological cycles that repeat about every twenty-four hours.”
“So I think clearly what we call circadian rhythms, these oscillating clocks within the body, within cells in the body, clearly exist.”
“Circadian rhythms are the outward manifestation of an internal timing system which is driven by several genetic elements, what we call circadian clock genes.”
“There is also the change in circadian rythmns, as I go from being a gainfully employed American to a retired one.”
“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.”
“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.”
“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.”
The Huffington Post: Hyungsoo Kim: Is It Possible To Re-Set Your Biological Clock?
“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
“Negative consequencesTeenager's biological rhythms - often referred to as their circadian rhythms - favor later bedtimes and later wake-up times.”
Voice of America: American Teenagers Dangerously Sleep Deprived
“The genes regulating this so-called circadian clock leave traces of their activity throughout the body.”
Lists
These user-created lists contain the word ‘circadian’.
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probablyankita's list
Words are all I have to take your heart away
apartheid, techno-klutz, logorrheic, gordian knot, anodyne, odor of sanctity, finders keepers, foot-in-mouth dis..., dutch uncle, masquerade, smoke signals, furtive glance and 320 more...
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phrontistery - c
from phrontistery.info
czardas, cytometer, cytology, cytheromania, cystoscope, cystolith, cyrenaic, cypseline, cyprinoid, cyphonism, cynophobia, cytogenesis and 1298 more...
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Words build meanings from origins( et...
These come from gamma meditation ,I think.
discursive, exogenous, machinations, purportedly, sumptuous, congruity, cantankerous, incongruous, festoon, hessian, ratiocinative, stratigraphic and 2046 more...
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SCIE - neurology
abducens.....draw..., ablation.....carr..., acetylcholine......., adrenalin.....nea..., afferent.....to c..., agnosia.....no kn..., alar.....wing-like, alexia.....no words, alveus.....canal, amacrine.....no l..., ambidextrous........, ambiguus.....doub... and 701 more...
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Quacksalvers et al. Nostrum
Bring forth the cathartic illumination on malignant,maniacal,medical,menage a trios and more egotists stymie
culpability, piousfraud, capacitous, rhabdomyolysis, scapula, idiosyncrasy, quiescent, malignant, nefarious, sociological, sociopath, pathogen and 202 more...
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Philosophic , etymology
every major discipline has uniquely developed esoteric nomenclature to facilitate interdisciplinary dissemination
quale , qualia, elegy, tacet, lexicon, annunciate, caste, eros, contrive, purlicue, irony, venacular, dilapidate and 567 more...
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A Matter Of Time
Favorite time-related words.
vespertine, twilight, gloaming, eftsoon, eventide, dawn, eos, dusk, witching hour, ephemeral, candlemark, autumnal and 122 more...
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the omnibus
preponderance, idioglossia, acumen, heteronym, flux, anacoluthon, metonymy, impetus, constellation, exegesis, revelatory, cloistered and 877 more...
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amber words
amber words is the term I use for words that are all but fossilized, in the sense that their use is always in the context of a single expression. Examples include caboodle, dudgeon, umbrage
sanctum, akimbo, amok, riddance, druthers, trove, caboodle, immemorial, blithering, dudgeon, swaddling, askance and 110 more...
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Reading Random
Got unknown words randomly
delinquency, modicum, dissuade, incendiary, destitute, lachrymose, plight, ruse, empirical, pedantic, demography, giggle and 444 more...
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adrift's Words
alluvial, motley, amygdala, skein, echo, lucent, evening, clasp, weft, ruinous, waver, eave and 122 more...
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christy927's list
...all my favorite words...
chrysalis, mahogany, indigo, elysian, rubenesque, cataclysmic, scythe, archaic, gaelic, trollop, sycamore, canopy and 279 more...
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richardr's Words
marmoreal, osteology, tyromancy, metalepsis, idioglossia, tapinosis, epicaricacy, carromancy, rogation, senex, aulic, gemütlichkeit and 279 more...
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gorgonglare's list
the best
zeppelin, ion, laconic, serendipity, cataract, saturnine, syzygy, cinnabar, bistro, lithium, paroxysm, scion and 694 more...
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esperanca's Words
portmanteau, vituperative, quixotic, quotidian, pandemonium, vexatious, milieu, moue, cantankerous, flibbertigibet, dalliance, bucolic and 190 more...
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noele's list
vertiginous, verdant, mellifluous, serpentine, verdigris, traject, amaranthine, luminous, phosphorescent, temerous, cerulean, shapeshifter and 531 more...
Tweets
Looking for tweets for circadian.
seanahan Interesting, the standard pronunciation really loses the etymology of circa-dian, around a day. Apr 13, 2009