Noah Webster's Dictionary (n.) One who defiles; one who corrupts or violates; that which pollutes.

Multi-Version Concordance Defiler (1 Occurrence) James 3:6 and the tongue is fire, the world of unrighteousness; the tongue is set in our members, the defiler of the whole body, and which sets fire to the course of nature, and is set on fire of hell. (DBY)