/ Dictionary / Index W water arum: Meaning and Definition of Find definitions for: wa'ter ar"um Pronunciation: [key] an aquatic arum plant, Calla palustris, of the North Temperate Zone, having heart-shaped leaves, tiny green flowers, and red berries. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. water water back Related Content Daily Word Quiz: sinister Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language