/ Dictionary / Index A arenaceous: Meaning and Definition of Find definitions for: ar•e•na•ceous Pronunciation: (ar"u-nā'shus), [key] — adj. (of rocks) sandlike; sandy. growing in sand. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: arenaceous (Thesaurus) arena Arena Chapel Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language