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 activity

New Collegiate Dictionary. 2001.

Look at other dictionaries:

  • 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 — Refers to events occurring within a 24 hour period, in the span of a full (24 hour) day, as in a circadian rhythm. The word “circadian” is a 20th century invention. It was coined in 1959 from the Latin “circa” (around) + “diem” (a day). However,… …   Medical 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

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”