water-lettuce

water lettuce

noun
a floating aquatic plant, Pistia stratiotes, of the arum family, having a rosette of thick, spongy leaves.

Origin:
1865–70

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
water lettuce

noun
pantropical floating plant forming a rosette of wedge-shaped leaves; a widespread weed in rivers and lakes [syn: pistia
WordNet® 3.0, © 2006 by Princeton University.
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