paraformaldehyde \par`a*form*al"de*hyde\, n. [Pref. para- +
formaldehyde.] (Chem.)
A polymer of formaldehyde obtained as a white crystalline
substance by concentration of a formaldehyde solution.
Formula {(CH20)n}. It dissolves in hot water with the release
of formaldehyde, and is used as a disinfectant.
[1913 Webster +PJC]