/yoo ree"euh fawr mal"deuh huyd', -feuhr-, yoor"ee euh-/ , Chem.
any of a group of resins formed by the interaction of urea and formaldehyde under conditions that include heat and pH control: used chiefly in the manufacture of buttons, baking enamels, and for making fabrics wrinkle-resistant.
[ 1940-45 ]