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sea lettuce

noun
1.
any seaweed of the genus Ulva, having large leaflike blades.
Origin
1660-1670
1660-70
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for sea-lettuce

sea lettuce

noun
1.
any of various green seaweeds of the genus Ulva, which have edible wavy translucent fronds
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for sea-lettuce

sea lettuce

(Ulva), a genus of green algae usually found growing on rocky shores of seas and oceans. Some species also grow in brackish water rich in organic matter or sewage. The thallus, which somewhat resembles a lettuce leaf, is a sheet of cells up to 30 cm (12 inches) long and two cells thick and is embedded in a tough gelatinous sheath. The life cycle consists of alternation of similar spore-producing (diploid) and gamete-producing (haploid) generations. Asexual reproduction is either by accidental fragmentation or by gametes that act like motile spores.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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