D defs.my
Entry 1 sense Webster, 1913

Barbituric acid

· Bar·bi·tu·ric ac·id · IPA /ˌbɑɹ.bɪˌt(j)ʊɹ.ɪk ˈæs.ɪd/
01 A white, crystalline substance, CH2(CO.NH)2.CO, derived from alloxantin, also from malonic acid and urea, and regarded as a substituted urea.
  1. 1.
    A white, crystalline substance, CH2(CO.NH)2.CO, derived from alloxantin, also from malonic acid and urea, and regarded as a substituted urea.(Chem.)