Pronunciation: (i-rup'tiv), [key]
1. bursting forth, or tending to burst forth.
2. pertaining to or of the nature of an eruption.
3. Geol.noting a rock formed by the eruption of molten material.
4. Pathol.causing or accompanied by an eruption or rash.
Geol.an eruptive rock.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.