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Pronunciation: (in-trOO'siv), [key]
1. tending or apt to intrude; coming without invitation or welcome: intrusive memories of a lost love.
2. characterized by or involving intrusion.
3. intruding; thrusting in.
4. Geol.
a. (of a rock) having been forced between preexisting rocks or rock layers while in a molten or plastic condition.
b. noting or pertaining to plutonic rocks.
5. Phonet.excrescent (def. 2).

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

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