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Definition of: barbituric acid
(bär′bə·t r′ik, -ty
r′ik, -ty r′-)
r′-) 
A synthetic compound, C4H4O3N2, from which barbiturates are derived. Also called malonylurea. [<NL (Usnea) barbata bearded (lichen) + -URIC]
 
				
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