What is 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 called?

interfuse — 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. (Webster's 1913.)