/ Dictionary / Index W water mold: Meaning and Definition of Find definitions for: wa'ter mold" Pronunciation: [key] — Mycol. Mycol. any of various aquatic fungi of the phylum Oomycota, free-living or parasitic in fish and other aquatic organisms. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. water moccasin water motor Related Content Daily Word Quiz: hedonist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language