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zeitgeber

[tsahyt-gey-ber] /ˈtsaɪtˌgeɪ bər/
noun
1.
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.
Origin of zeitgeber
1970-1975
1970-75; < German (1954), literally, time-giver, on the model of Taktgeber an electronic synchronization device
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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