IPA: //ˈzaɪtˌɡeɪbər//
KK: /ˈzaɪtˌɡeɪbər/
A signal from the environment that helps to regulate the body's internal clock, such as changes in light or temperature.
The sunrise acts as a natural zeitgeber, helping to wake people up in the morning.
Zeitgeber is a compound word from the German "Zeit" (meaning time) and "geber" (meaning giver). It refers to an external cue that helps regulate the body's biological clock, essentially a 'time giver.'
Think of 'time' ('Zeit') being given or provided ('geber') to help regulate your body's internal clock.
No commonly confused words.