- extruding or tending to extrude
- Geol. designating or of igneous rock formed from lava that hardened on the surface of the earth, moon, etc.
Derived from magma poured out or ejected at the earth's surface. Used of igneous rocks.
(comparative more extrusive, superlative most extrusive)
- Jutting out; extruding.
- (geology) Rock which has been formed through volcanic extrusion.