Also found in: Medical, Encyclopedia.


The study of the effects of time and rhythmical phenomena on life processes.

chron′o·bi·o·log′ic (-ə-lŏj′ĭk), chron′o·bi·o·log′i·cal (-ĭ-kəl) adj.
chron′o·bi·o·log′i·cal·ly adv.
chron′o·bi·ol′o·gist n.


(Biology) relating to chronobiology
References in periodicals archive ?
We can refer again to the double face of Mel, as a chronobiologic hormone and as a highly efficient antioxidant and free radical scavenger.
Not only is saliva testing more accurate, inasmuch as it measures only the active free hormone, but it also allows chronobiologic testing, which is not feasible with serum testing with its attendant venipunctures.
Studies by our group (10) and others (11) have shown that overattention to mood variation without considering associated cognitive, speech-language, chronobiologic, and motor signs of mania /hypomania accounts for substantial overdiagnosis of BD in patients with non-specific mood disturbances, particularly in those with active substance abuse or borderline personality disorder (BPD).
With respect to circadian dysregulation, research suggests that chronobiologic abnormalities, in the form of phase shifts of the core-body temperature rhythm, are related to sleep initiation or maintenance problems (12).
Common triggering events include alcohol consumption, excessive stress, dietary changes, change in sleeping patterns, chronobiologic changes, and hormonal changes due to menstruation.
In addition, melatonin, a neurohormone with significant chronobiologic properties, has been quantified in the flowering tops of H.