/ Dictionary / Index I igneous: Meaning and Definition of Find definitions for: ig•ne•ous Pronunciation: (ig'nē-us), [key] — adj. produced under conditions involving intense heat, as rocks of volcanic origin or rocks crystallized from molten magma. of, pertaining to, or characteristic of fire. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: igneous (Thesaurus) Ignatius of Loyola, Saint ignescent Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language