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
Why do we write the sound of a dog barking as bow wow? Isn’t that noise more like woof, woof or arf, arf or ruff ruff? Surprisingly, the oldest of these is bow wow, or as William Shakespeare wrote in The Tempest (Bookshop|Amazon), bowgh wawgh...
Vogelheu—literally, “Vogelheu”—is a Swiss dish with toasted bread, cubed and cooked with eggs and other ingredients for a tasty meal that makes efficient use of leftover bread. This is part of a complete episode.
Related
what does the biological organizion mean. I need a definnion of the word?