Pronunciation: (in-vā'siv), [key]
1. characterized by or involving invasion; offensive: invasive war.
2. invading, or tending to invade; intrusive.
3. Med.requiring the entry of a needle, catheter, or other instrument into a part of the body, esp. in a diagnostic procedure, as a biopsy.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.