Igneous rock that solidified on surface following a volcanic eruption; extrusive rock or lava; generally cools quickly, therefore is fine grained.
Igneous rocks derived from magma or magmatic materials that are poured out or ejected (extruded) at or very near the Earth's surface.
a crystalline or glassy igneous rock formed by volcanic action near the earth's surface. [AHDOS
Volcanic rock is an igneous rock of volcanic origin.