/ Dictionary / Index D duckweed: Meaning and Definition of Find definitions for: duck•weed Pronunciation: (duk'wēd"), [key] — n. any plant of the family Lemnaceae, esp. of the genus Lemna, comprising small aquatic plants that float free on still water. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: duckweed (Thesaurus) duck-walk duckwheat Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language