The Collaborative International Dictionary of English v.0.48:

Infrigidate \In*frig"i*date\, v. t. [L. infrigidatus, p. p. of
   infrigidare to chill. See 1st In-, and Frigid.]
   To chill; to make cold; to cool. [Obs.] --Boyle.
   [1913 Webster]