Definition of sea lettuce in English:

sea lettuce

noun

mass noun
  • An edible seaweed with green fronds that resemble lettuce leaves.

    • ‘For other species you should look closely at the kelp and purple sea lettuces, where you will often find various exotic-looking examples in the process of mating.’
    • ‘Species of sea lettuce form light yellowish green to dark green sheets and are common to our area and most shorelines around the world.’
    • ‘Removing the sea lettuce will reduce the amount of nutrients in the ecosystem, which would be returned to the water if algae were allowed to decompose in place.’