Infiltrator

//ˈɪnfɪltɹeɪtə// noun

Definitions

Noun
  1. 1
    One who infiltrates an organization or territory; an undercover or covert agent.

    "Sometimes Israelis were attacked by Arab infiltrators, and hardly a month went by without a West Jerusalemite either being killed or wounded."

  2. 2
    an intruder (as troops) with hostile intent wordnet
  3. 3
    someone who takes up a position surreptitiously for the purpose of espionage wordnet

Etymology

From infiltrate + -or.

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