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sea lettuce (plural sea lettuces)

  1. Any of several edible seaweeds of the genus Ulva.
  2. Similar seaweed species of other genera:
    1. Monostroma spp., also known as the slender sea lettuce, a kind of algae.
    2. Scaevola taccada, also known as the beach cabbage, a terrestrial flowering plant species that is native to coastal regions of the Indo-Pacific.
    3. Dudleya caespitosa, also known as the sand lettuce, a terrestrial flowering plant species that is endemic to coastal areas of California

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