- * * *Relating to biologic variations or rhythms with a cycle of about 24 hours. Cf.:infradian, ultradian. [L. circa, about, + dies, day]
* * *cir·ca·di·an (.)sər-'kad-ē-ən, -'kād-; .sər-kə-'dī-ən, -'dē- adj being, having, characterized by, or occurring in approximately 24-hour periods or cycles (as of biological activity or function) <\circadian periodicity> <\circadian rhythms in behavior or physiological activity> compare INFRADIAN, ULTRADIAN
* * *adj.
* * *cir·ca·di·an (sər-kaґde-ən) [L. circa about + dies a day] pertaining to a period of about 24 hours; applied especially to the rhythmic repetition of certain phenomena in living organisms at about the same time each day (circadian rhythm).
Medical dictionary. 2011.
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circadian — CIRCADIÁN adj. (med.; în sintagma) Ritm circadian = ritm biologic intern pe o durată de aproximativ 24 de ore al unui organism (aflat în imposibilitatea de a sesiza alternanţa dintre zi şi noapte). [pr.: di an] – Din fr. circadien. Trimis de hai … Dicționar Român
circadian — (adj.) coined 1959 from L. circa about (see CIRCA (Cf. circa)) + diem, accusative singular of dies day (see DIURNAL (Cf. diurnal)). The original use is in circadian rhythm … Etymology dictionary
circadian — *daily, diurnal, quotidian … New Dictionary of Synonyms
circadian — ► ADJECTIVE ▪ (of biological processes) recurring on a twenty four hour cycle. ORIGIN from Latin circa about + dies day … English terms dictionary
circadian — [sər kā′dē ən, sʉr΄kə dē′ən] adj. [coined < L circa, about + diem, acc. sing. of dies, day: see DEITY] Biol. designating or of behavioral or physiological rhythms associated with the 24 hour cycles of the earth s rotation, as, in man, the… … English World dictionary
circadian — adjective Etymology: Latin circa about + dies day + English 2 an more at deity Date: 1959 being, having, characterized by, or occurring in approximately 24 hour periods or cycles (as of biological activity or function) < circadian rhythms in… … New Collegiate Dictionary
circadian — adj. [L. circum, about; dies, day] Pertaining to a metabolic or behavorial phenomena in living organisms at about twenty four hour intervals; circadian rhythm; diurnal rhythm … Dictionary of invertebrate zoology
circadian — adjective of, relating to, or showing rhythmic behaviour with a period of 24 hours; especially of a biological process The circadian clock is involved in the regulation of the diurnal sleep wake cycle, […] … Wiktionary
circadian — adj. Circadian is used with these nouns: ↑clock, ↑rhythm … Collocations dictionary
circadian — cir|ca|di|an [sə:ˈkeıdiən US sə:r ] adj [only before noun] technical [Date: 1900 2000; : Latin; Origin: circa around, about + dies day ] relating to a period of 24 hours, used especially when talking about changes in people s bodies ▪ the body s… … Dictionary of contemporary English