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noun
Type genus of the family Ulvaceae; green seaweed having a thallus two cells thick: sea lettuce.
synonym: Ulva.
is a specific kind of: protoctist genus.
has as a member: laver, sea lettuce.
is a member of: family Ulvaceae, sea-lettuce family, Ulvaceae.
Find more on genus Ulva elsewhere: etymology - rhymes - Wikipedia.
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