zeitgeber

[tsahyt-gey-ber]

zeit·ge·ber

[tsahyt-gey-ber]
noun
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:
1970–75; < German (1954), literally, time-giver, on the model of Taktgeber an electronic synchronization device
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Zeitgeber is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
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