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(biology) Occurring or having cycles of approximately annual periodicity quotations
[…] because morbidity and mortality from cardiovascular disease also reveal statistically significant circadian and circannual rhythms.
1956, USAF School of Aerospace Medicine, Report , page 11
Circannual rhythms control reproductive function in seasonal breeders.
2000, Martin Hume Johnson, Barry J. Everitt, Essential Reproduction, page 110
Seasonal variations in locomotor activity are generated by a circannual clock […].
2001, Joseph S. Takahashi, Fred W. Turek, Robert Y. Moore, Handbook of Behavioral Neurobiology, page 523