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Look up intrusive in Wiktionary, the free dictionary.
Intrusive may refer to:
- Intrusiveness, a typically unwelcome behavior, interrupting and disturbing to others
- Intrusive rock, intrusion of molten magma leaving behind igneous rock
- Saltwater intrusion, the movement of saline water into freshwater aquifers
- Intrusive thought, an unwelcome involuntary thought, image, or unpleasant idea
- Linking and intrusive R, in phonetics