rhythm

(redirected from circannual rhythm)
Also found in: Dictionary, Thesaurus, Medical, Encyclopedia.
See: regularity
References in periodicals archive ?
One well-accepted hypothesis is that patterns of melatonin mediate the synchronization between an endogenous circannual rhythm in reproductive activity and the external annual rhythm in day length.
Circadian and circannual rhythms of T3 and T4 secretions in Polwarth-Ideal Rams.