/ Dictionary / Index M magnetic core: Meaning and Definition of Find definitions for: magnet'ic core' Pronunciation: [key] core (def. 12). core (def. 3). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. magnetic concentration magnetic course Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language