Pronunciation: (in"tru-tu-loor'ik), [key]
1. Geol.located in, taking place in, or resulting from action beneath the lithosphere.
2. Petrog.noting or pertaining to crystallization of magma that begins previous to its extrusion on the surface.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.