GNU Collaborative International Dictionary of English

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Found one definition

1.       
   paraformaldehyde (?), 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]