extrusive

Definitions of extrusive

1. adjective

   of rock material; forced out while molten through cracks in the earth's surface
   synonyms:

   volcanic

   igneous rock produced by eruption and solidified on or near the earth's surface; rhyolite or andesite or basalt

   antonyms:

   intrusive

   of rock material; forced while molten into cracks between layers of other rock

   irruptive, plutonic

   of igneous rock that has solidified beneath the earth's surface; granite or diorite or gabbro