circannual

English

Etymology

Formed as circ(a) +‎ annual, after circadian.

Adjective

circannual (not comparable)

1. (biology) Occurring or having cycles of approximately annual periodicity
   • 1956, USAF School of Aerospace Medicine, Report [80-114], [1956], page 11:

     […] because morbidity and mortality from cardiovascular disease also reveal statistically significant circadian and circannual rhythms.

   • 2000, Martin Hume Johnson, Barry J. Everitt, Essential Reproduction, page 110:

     Circannual rhythms control reproductive function in seasonal breeders.

   • 2001, Joseph S. Takahashi, Fred W. Turek, Robert Y. Moore, Handbook of Behavioral Neurobiology, page 523:

     Seasonal variations in locomotor activity are generated by a circannual clock […].