water lettuce

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WORDNET DICTIONARY

Noun water lettuce has 1 sense

water lettuce(n = noun.plant) pistia, pistia stratiotes, pistia stratoites, water cabbage - pantropical floating plant forming a rosette of wedge-shaped leaves; a widespread weed in rivers and lakes;

is a member of genus pistia

is a kind of aquatic plant, hydrophyte, hydrophytic plant, water plant

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CIDE DICTIONARY

water lettuce,

A plant (Pistia stratiotes) which floats on tropical waters, and forms a rosette of spongy, wedge-shaped leaves. J. Smith (Dict. Econ. Plants). [1913 Webster]