Definition of methylolurea 

: either of two compounds formed as the first stage in making urea-formaldehyde resins:

a : a crystalline compound H2NCONHCH2OH obtainable from one mole each of urea and formaldehyde and used especially for impregnating wood with which it forms hard resins

called also monomethylolurea

b : dimethylolurea

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History and Etymology for methylolurea

methylol + urea

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