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zeitgeber

[tsahyt-gey-ber]
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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.
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Origin of zeitgeber

1970–75; < German (1954), literally, time-giver, on the model of Taktgeber an electronic synchronization device
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018