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For the chemists among you, urea is an organic chemical compound composed of two amidogen groups joined by a carbonyl functional group.

A compound formed by the union of amidogen with an acid element or radical.

Containing, or derived from, amidogen. ÷ acid, an acid in which a portion of the nonacid hydrogen has been replaced by the ~ group.

Many of these are colourless bodies containing the Amidogen group NH2, which imparts to them basic properties enabling them to combine with solids to form salts, and these salts have a strong colouring power.