great duckweed
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| Noun | 1. | great duckweed - cosmopolitan except South America and New Zealand and some oceanic islands duckweed - any small or minute aquatic plant of the family Lemnaceae that float on or near the surface of shallow ponds genus Spirodela, Spirodela - minute aquatic herbs floating on the water surface consisting of a shiny leaflike frond and 2-21 roots |
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