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formaldehyde 
  n a colourless poisonous irritating gas with a pungent characteristic odour, made by the oxidation of methanol and used as formalin and in the manufacture of synthetic resins. Formula: HCHO, (Systematic name)  methanal 
  (C19: form(ic) + aldehyde; on the model of German Formaldehyd) 

urea-formaldehyde resin 
  n any one of a class of rigid odourless synthetic materials that are made from urea and formaldehyde and are used in electrical fittings, adhesives, laminates, and finishes for textiles 



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