barbituric acid /ˌbɑːbɪˈtjʊərɪk, -ˈtʃʊərɪk/

b

I. noun [ mass noun]

1.
[Chemistry] a synthetic organic acid from which the barbiturates are derived.

●A cyclic derivative of urea and malonic acid; chem. formula: C4H4O3N2.
– origin mid 19th cent.: from French barbiturique, from German Barbitursäure, from the given name Barbara + Säure ‘acid’.

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