An Etymological Dictionary of the German Language/ur-
Appearance
ur-, pref., from MidHG. and OHG. ur-; an accented prefix of which er- (MidHG. er-, OHG. ir-) is the unaccented form. In OHG., ur, ‘out of,’ is met with as a prep. The prefix signifies ‘out of, originally, in the beginning.’ Goth. has us (uz), of which there are no certain cognates in the other Aryan languages.