/ Dictionary / Index E epsomite: Meaning and Definition of Find definitions for: ep•som•ite Pronunciation: (ep'su-mīt"), [key] — n. Mineral. the natural form of Epsom salt, MgSO&multiplydot;7HO, found as a crust in caves and lake deposits. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Epsom Epsom salt Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language