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 (tsīt′gĕb′ər, zīt′-)
An external stimulus or cue, such as daylight or a regularly repeated occurrence, that serves to regulate an organism's biological clock.

[German Zeitgeber : Zeit, time; see Zeitgeist + Geber, giver (from geben, to give, from Middle High German, from Old High German geban; see ghabh- in Indo-European roots).]


(Biology) biology an agent or event, such as light or the tide, that triggers the biological clock of organisms


(ˈtsaɪtˌgeɪ bər)
an environmental cue, as the length of daylight or the degree of temperature, that helps to regulate the cycles of an organism's biological clock.
[1970–75; < German (1954), literally, time-giver]
References in periodicals archive ?
Zeitgeber is German for "time giver," and examples include light, temperature, noise, exercise, and feeding regimens.
Although training will most likely be reduced upon arrival, exercise can act as a zeitgeber and be beneficial to adjusting to new time zone and so should not be completely eliminated, however this is likely to be more effective when a phase delay is required after westerly travel (Reilly et al.
Animals entrained to 12/12-hr light/dark cycles were decapitated, and livers were collected at 4-hr intervals starting at zeitgeber time (ZT) 0, the time of lights on, or ZT12, the time of lights off.
Exposure to natural sunlight acts as a potent natural Zeitgeber (agents that synchronise the body clock rhythm).
The social zeitgeber theory, circadian rhythms, and mood disorders: review and evaluation.
Moreover, the laboratory photoperiod, which is the most important Zeitgeber for many organisms (including arthropods, see Aschoff 1960), reproduced the same seasonal variation observed in nature from winter to summer.
It may be this pathway which allows light to be a strong zeitgeber (an external cue that entrains one's circadian rhythm).