Definition from Wiktionary, the free dictionary
- Jutting out; extruding.
- (geology) of rocks: forced, while in a plastic or molten state, on to the earth's surface to lie atop of existing rocks.
jutting out or extruding
of molten rock forced on to the Earth's surface
extrusive (plural extrusives)
- (geology) Rock which has been formed through volcanic extrusion.
rock formed through extrusion