/ Dictionary / Index M magma: Meaning and Definition of Find definitions for: mag•ma Pronunciation: (mag'mu), [key] — pl. -mas, -ma•ta molten material beneath or within the earth's crust, from which igneous rock is formed. any crude mixture of finely divided mineral or organic matter. a paste composed of solid and liquid matter. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: magma (Thesaurus) maglev magn- Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language