water lettuce

noun

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

Origin of water lettuce

First recorded in 1865–70

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for water lettuce

Historical Examples of water lettuce

Like the lake, it has great patches of water-lettuce, which in some places almost bridge the channel.
With the World's Great Travellers, Volume 1
Various
This is principally formed of the water-lettuce, or Pistia, an aquatic plant with long roots which descend to the bottom.
With the World's Great Travellers, Volume 1
Various