8 letters · 19 points in Scrabble
noun any small or minute aquatic plant of the family Lemnaceae that float on or near the surface of shallow ponds
originFrom duck + weed. Supposedly so-named for often being consumed by ducks and other waterfowl. Compare Middle English dokemete (“duckweed”, literally “duck-food”).
Etymology from Wiktionary, CC BY-SA 3.0