Word of the Day

Tuesday, April 03, 2012

zeitgeber

\TSAHYT-gey-ber\ , noun;
1.
An environmental cue, as the length of daylight, that helps to regulate the cycles of an organism's biological clock.
Quotes:
The light–dark transition Zeitgeber is widely used by plants to set internal clocks not just for leaf movement but for many other activities as well.
-- John King, Reaching for the Sun
The most prominent zeitgeber in humans is the light/dark cycle.
-- Harold R. Smith, Cynthia Comella, Birgit Högl, Sleep Medicine
Origin:
Zeitgeber comes directly from the German word which literally means "time-giver." It entered into English in the 1970s.
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