Source : Webster's Revised Unabridged Dictionary (1913)

Refrigerant \Re*frig"er*ant\ (r?*fr?j"?r-ant), a. [L.
   refrigerans, p. pr. of refrigerare: cf. F. r['e]frig['e]rant.
   See {Refrigerate}.]
   Cooling; allaying heat or fever. --Bacon.

Refrigerant \Re*frig"er*ant\, n.
   That which makes to be cool or cold; specifically, a medicine
   or an application for allaying fever, or the symptoms of
   fever; -- used also figuratively. --Holland. ``A refrigerant
   to passion.'' --Blair.

Source : WordNet®

refrigerant
     adj : causing cooling or freezing; "a refrigerant substance such
           as ice or solid carbon dioxide" [syn: {refrigerating}]
     n : a substance used to provide cooling (as in a refrigerator)