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upward
upward mobility
upwardly mobile
upwelling
upwind
Ur
ur- (1)
ur- (2)
uracil
uraemia
uraeus
Ural
Ural-Altaic
Ural Mountains
Uralian
Uralic
uralite
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uracil
u·ra·cil [ yrəssil ]


noun 
Definition:
 
RNA component: a pyrimidine base, one of the four bases in RNA in which it pairs with thymine.
Symbol  U
[Late 19th century. Origin ?]
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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