/ Dictionary / Index E extrusive: Meaning and Definition of Find definitions for: ex•tru•sive Pronunciation: (ik-str'siv, -ziv), [key] — adj. tending to extrude. pertaining to extrusion. noting or pertaining to a class of igneous rocks that have been forced out in a molten or plastic condition upon the surface of the earth. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: extrusive (Thesaurus) extrusion press exuberance Related Content Daily Word Quiz: persevere Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language