TSYT'ge'buhr - n. [Ger: time-giver, on the model of Taktgeber an
electronic synchronization device]
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.
"Through careful diet regulation and elimination of all zeitgeber, Lavrik slowly ceased to be human." - Mavril
from A Word A Day