circadianadj.

Brit.

/səːˈkeɪdɪən/, U.S.

/sərˈkeɪdiən/

Etymology: < Latin circa about + dies day (see diurnal adj. and n.) + -an suffix.

Designating physiological activity which occurs approximately every twenty-four hours, or the rhythm of such activity.

ΘΚΠ

the mind > mental capacity > psychology > mental action or process > [adjective] > recurrent every 24 hours

circadian1959

1959 F. Halberg in Zeitschr. f. Vitamin- Hormon- & Fermentforschung X. 235 ‘Circadian’ might be applied to all ‘24 hour’ rhythms, whether or not their periods..are different from 24 hours, longer or shorter, by a few minutes or hours.

1963 J. Leith tr. Fraisse Psychol. of Time i. 20 Circadian rhythms in animals, unlike plants, are almost always acquired.

1964 Perceptual & Motor Skills XIX. 211 (heading) Circadian activity and noise comparisons of two confined groups with or without reference to clock time.

1964 Perceptual & Motor Skills XIX. 211 Both measures revealed highly positive correlations between the mean circadian patterns of the two groups.

This entry has not yet been fully updated (first published 1972; most recently modified version published online March 2022).

单词	circadian
释义	circadianadj. Brit. /səːˈkeɪdɪən/, U.S. /sərˈkeɪdiən/ Etymology: < Latin circa about + dies day (see diurnal adj. and n.) + -an suffix. Designating physiological activity which occurs approximately every twenty-four hours, or the rhythm of such activity. ΘΚΠ the mind > mental capacity > psychology > mental action or process > [adjective] > recurrent every 24 hours circadian1959 1959 F. Halberg in Zeitschr. f. Vitamin- Hormon- & Fermentforschung X. 235 ‘Circadian’ might be applied to all ‘24 hour’ rhythms, whether or not their periods..are different from 24 hours, longer or shorter, by a few minutes or hours. 1963 J. Leith tr. Fraisse Psychol. of Time i. 20 Circadian rhythms in animals, unlike plants, are almost always acquired. 1964 Perceptual & Motor Skills XIX. 211 (heading) Circadian activity and noise comparisons of two confined groups with or without reference to clock time. 1964 Perceptual & Motor Skills XIX. 211 Both measures revealed highly positive correlations between the mean circadian patterns of the two groups. This entry has not yet been fully updated (first published 1972; most recently modified version published online March 2022). < adj.1959
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