8 letters · 15 points in Scrabble
adjective relating to or produced by or consisting of volcanoes
adjective explosively unstable
adjective igneous rock produced by eruption and solidified on or near the earth's surface; rhyolite or andesite or basalt
originFrom French volcanique, from volcan (“volcano”); and/or directly from volcan(o) + -ic.
Etymology from Wiktionary, CC BY-SA 3.0