/ Dictionary / Index A arkose: Meaning and Definition of Find definitions for: ar•kose Pronunciation: (är'kōs), [key] — n. a granular sedimentary rock composed of quartz and feldspar or mica; a feldspathic sandstone. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ark of the covenant ark shell Related Content Daily Word Quiz: sumptuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language