Infiltration

Part of speech: noun (n.)

1. The act or process of infiltrating, as if water into a porous substance, or of a fluid into the cells of an organ or part of the body.

2. The substance which has entered the pores or cavities of a body. Addison. Calcareous infiltrations filling the cavities. Kirwan. Fatty infiltration. (Med.) See under Fatty. -- Infiltration gallery, a filter gallery.