ur- 1
var. of uro- 1 : uranalysis.
ur- 2
var. of uro- 2 before a vowel: urite.
ur- 3
( sometimes cap. )
a combining form meaning "earliest, original," used in words denoting the primal stage of a historical or cultural entity or phenomenon: ur-civilization; urtext.
[ ur-, MHG, OHG; c. OE or- ]