The Collaborative International Dictionary of English v.0.48:

Infrigidation \In*frig`i*da"tion\, n. [L. infrigidatio.]
   The act of chilling or causing to become cold; a chilling;
   coldness; congelation. [Obs.] --Boyle.
   [1913 Webster]

WordNet (r) 3.0 (2006):

infrigidation
    n 1: the process of cooling or freezing (e.g., food) for
         preservative purposes [syn: refrigeration,
         infrigidation]