One who infiltrates an organization or territory; an undercover or covert agent.

plural of infiltrator

That infiltrates

In an infiltrative manner; by means of infiltration

An infiltrator; a spy who covertly enters a territory or organisation. / A substance that penetrates an object to give it some property, such as waterproofing.

Able to undergo infiltration (of water).

plural of infiltration

The act or process of infiltrating, as of water into a porous substance, or of a fluid into the cells of an organ or part of the body. / The substance which has entered the pores or cavities of a body.

(transitive, intransitive) To surreptitiously penetrate, enter or gain access to. / (transitive) To cause to penetrate in this way.

(pathology) Any undesirable substance or group of cells that has made its way into part of the body.