n. The compound formed by condensation of two molecules of urea with the loss of a molecule of ammonia, (NH2-CO)2NH, or any of its derivatives
the GNU version of the Collaborative International Dictionary of English
n. A white, crystalline, nitrogenous substance, C2O2N3H5, formed by heating urea. It is intermediate between urea and cyanuric acid.
The Century Dictionary and Cyclopedia
n. A compound (C2H5N3O2 + H2O) formed by exposing urea to a high temperature for a long time. It forms crystals readily soluble in water and alcohol.
Word Usage
"The position of the atoms in cytosine could be determined, because under the action of an oxidizing agent this substance breaks down into biuret and oxalic acid, and this elucidation of its constitution was soon followed by its synthesis."