The German prefix "ur-" is a time machine. Unfortunately, it only has one setting: to WAY back. A few examples:

alt = old
uralt = very old, ancient

Wald = forest
Urwald = primeval forest, jungle

Zustand = condition
Urzustand = original condition

Großmutter = grandmother
Urgroßmutter = great-grandmother
(here, each added "ur-" will make you jump back one more generation)

Funny: "Uhr" means "clock", so the "Ur-Uhr" would be the first clock ever - if someone finds it.

Enjoy ur-language!