\In`ter*fuse"\, v. t. [L. interfusus, p. p. of
interfundere to pour between; inter between + fundere to
pour. See {Fuse} to melt.]
1. To pour or spread between or among; to diffuse; to
   scatter.
         The ambient air, wide interfused, Embracing round
         this florid earth.                    --Milton.
2. To spread through; to permeate; to pervade. [R.]
         Keats, in whom the moral seems to have so perfectly
         interfused the physical man, that you might almost
         say he could feel sorrow with his hands. --Lowell.
3. To mix up together; to associate. --H. Spencer.