Synonyms of the word

extrusive

• adj. Jutting out; extruding.
• adj. (geology) of rocks: forced, while in a plastic or molten state, on to the earth's surface to lie atop…
• n. (geology) Rock which has been formed through volcanic extrusion.

volcanic

• adj. (geology, planetology) of or pertaining to a volcano or volcanoes.
• adj. (geology, planetology) produced by a volcano, or, more generally, by igneous agencies.
• adj. (geology, planetology) changed or affected by the heat of a volcano.
• adj. (figuratively) reminiscent of a volcano; explosive, violent, full of suppressed anger, energy etc.
• n. A volcanic rock.