Extrusive
Part of speech: adjective
Definition: Jutting out; extruding.
Part of speech: noun
Definition: Rock which has been formed through volcanic extrusion.
Volcanic
Part of speech: adjective
Definition: Of or pertaining to a volcano or volcanoes; as, volcanic heat.Produced by a volcano, or, more generally, by igneous agencies; as, volcanic tufa.Changed or affected by the heat of a volcano.Potentially or powerfully explosive.