duckweed

/ˌdʌkˈwid/

Other forms: duckweeds

Definitions of duckweed

1. noun

   any small or minute aquatic plant of the family Lemnaceae that float on or near the surface of shallow ponds
   types:

   Lemna minor, common duckweed, lesser duckweed

   of temperate regions except eastern Asia and Australia

   Lemna trisulca, star-duckweed

   cosmopolitan in temperate regions except North America

   Spirodela polyrrhiza, great duckweed, water flaxseed

   cosmopolitan except South America and New Zealand and some oceanic islands

   watermeal

   any of various aquatic plants of the genus Wolffia; throughout warmer regions of the world

   Wolffiella gladiata, bogmat, mud midget

   having narrow flat sickle-shaped submerged fronds; North America

   Wolffia columbiana, common wolffia

   smallest flowering plants known; of the Americas

   type of:

   aquatic plant, hydrophyte, hydrophytic plant, water plant

   a plant that grows partly or wholly in water whether rooted in the mud, as a lotus, or floating without anchorage, as the water hyacinth