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  • adjective biology Occurring or having cycles of approximately annual periodicity


Sorry, no etymologies found.


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  • The real answer lies in circadian and circannual rhythmicity, chronobiology, evolution vs. modern life.

    T.S. Wiley: Sick and Tired, the Book of the Dead 2010

  • If I remember correctly, your posts were primarily about the various rhythms (circadian, circannual, etc.), which is interesting, but is really at a much lower level (early perceptual, pre-cortical, and very primitive) than what I usually deal with, or know much about.

    Time Perception II: Cognitive Factors Chris 2004

  • The only well developed visual domains are those involved in controlling the circadian and circannual biological rhythms - the suprachiasmatic nucleus and the retinohypothalamic projections.

    PLoS ONE Alerts: New Articles Ondřej Kott et al. 2010

  • The reindeer use those few weeks of spring (and fall) to measure daylength (photoperiod) and thus time their seasonality - or in other words, to reset their internal calendar: the circannual clock.

    ScienceBlogs Channel : Life Science Coturnix 2010

  • Controls circadian and circannual rhythms by stimulation of the brain - possibly involved in the maturation of sexual organs

    CreationWiki - Recent changes [en] 2009


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