/ Dictionary / Index H heavy mineral oil: Meaning and Definition of Find definitions for: heav'y min'eral oil". Pronunciation: [key] See under Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. heavy metal heavy nitrogen Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language