|parə+ noun
Etymology: International Scientific Vocabulary para- (I) + formaldehyde
: a white solid that is a mixture of hydrated polymers of formaldehyde having the formula (HCHO) n .H 2 O or HO(CH 2 O) n H in which n varies from about 8 to 100, that is usually made by evaporation of an aqueous solution of formaldehyde, that readily regenerates formaldehyde especially on heating, and that is used as a source of formaldehyde : a mixture of polyoxymethylene glycols