zeitgeber n. a naturally occurring cue, such as light or temperature, which regulates biological rhythms; something which influences or regulates the timing or rhythm of something else. Etymological Note: zeit ‘time’ + geber ‘giver.’ Coined by Jürgen Aschoff, ca. 1954. (source: Double-Tongued Dictionary)
Further reading
Sean in Oneonta, New York, says that when he was growing up in New Jersey, his family would pile in the car and set off on a surprise adventure, whether a short distance or long, and the kids would be told only that they were going on Buxtehude...
The German phrase Der Bus hält an jeder Milchkanne literally translates as “The bus stops at every milk can,” and refers to a bus that stops at every little out-of-the-way town. This is part of a complete episode.
Related
what does the biological organizion mean. I need a definnion of the word?