1.To pour or spread between or among; to diffuse; to scatter. "The ambient air, wide interfused, Embracing round this florid earth."
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."
3.To mix up together; to associate.