ur-

ur-

1
variant of uro-1: uranalysis.
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ur-

2
variant of uro-2. before a vowel: urite.

ur-

3
(sometimes initial capital letter)
a combining form meaning “earliest, original,” used in words denoting the primal stage of a historical or cultural entity or phenomenon: ur-civilization; urtext.

Origin:
< German ur-, Middle High German, Old High German; cognate with Old English or-

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
ur-
 
combining form
uro- a variant of uro-

Ur-
 
combining form
original, primitive: Ursprache
 
[German]

uro- or (before a vowel) ur-1
 
combining form
indicating urine or the urinary tract: urochrome; urogenital; urolith; urology
 
[from Greek ouron urine]
 
ur- or (before a vowel) ur-1
 
combining form
 
[from Greek ouron urine]

uro- or (before a vowel) ur-2
 
combining form
indicating a tail: urochord; uropod; urostyle
 
[from Greek oura]
 
ur- or (before a vowel) ur-2
 
combining form
 
[from Greek oura]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

ur-
prefix meaning "original, earliest, primitive," from Ger. "original, primitive;" at first only in words borrowed from Ger. (cf. ursprache "hypothetical primitive language," attested in Eng. from 1908), now a living prefix in Eng. Cf. also Urschleim under protoplasm and Urquell under Pilsner.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

ur- pref.
Variant of uro-1.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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