/ Dictionary / Index J jarosite: Meaning and Definition of Find definitions for: jar•o•site Pronunciation: ( jar'u-sīt", ju-rō'sīt), [key] — n. a yellowish or brownish mineral, a hydrous sulfate of potassium and iron, KFe(SO)(OH), occurring in small crystals or large masses. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Jarmoite jarovize Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language