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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).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Biology) biology an agent or event, such as light or the tide, that triggers the biological clock of organisms
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(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]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Initially, presuming (to their credit) that light-dark cycles would be especially important entrainment signals for people, Aschoff and Wever launched the first systematic investigation of human-relevant zeitgebers in a newly-built underground soundproof bunker specifically designed to insulate subjects from all external time cues.
(10.) Rouleau N, Dotta BT (2014) Electromagnetic fields as structure-function zeitgebers in biological systems: Environmental orchestrations of morphogenesis and consciousness.
Moreover, behavioral and environmental aspects, as light-dark circle and zeitgebers influencing the circadian rhythms, like bedtime routines, temperature, social interactions, exercise, and so forth, are known to influence melatonin secretion; however, in case of the studied groups, blood collection was performed under controlled conditions.
Actigraphic studies show a close interdependence of couples' sleep [17], being in line with the notion of partners as social zeitgebers [18].
The endogenous mammalian circadian clock has a period of approximately 24 hours, which is reset daily by external cues, known as zeitgebers. The most potent of these is a daily light cue, which entrains the clock in the SCN in mammals through reticulo-hypothalamic signalling mechanisms.
These shallow periods may enhance the ability of fish to use sunrise and sunset as zeitgebers to entrain a circadian clock (Aschoff, 1965; Takahashi and Zatz, 1982; Neilson and Perry, 1990) or may represent optimal times for feeding on shallow-water prey, such as flying fish, a main portion of the diet of dolphinfish (Olson and Galvan-Magana, 2002).
Influence of chronotype and social zeitgebers on sleep/wake patterns.
Because poor sleep can impair quality of life, decrease the progression of the recovery process, and increase one's risk for other diseases, (8,9) patients in the POWER program learn the physiology of sleep, including the management of circadian rhythms, social and biological zeitgebers, and the connection between sleep and memory.
The rhythm is entrained by external cues known as zeitgebers. Zeitgeber is German for "time giver," and examples include light, temperature, noise, exercise, and feeding regimens.
Circadian rhythms of FAA are thought to be controlled by a food-entrainable oscillator (FEO) outside of the suprachiasmatic nucleus (SCN); RF schedules are potent zeitgebers capable of entraining metabolic and hormonal rhythms in peripheral oscillators in anticipation of food.