Noun genus ulva has 1 sense
  1. Ulva, genus Ulva - type genus of the family Ulvaceae; green seaweed having a thallus two cells thick: sea lettuce
    --1 is a kind of protoctist genus
    --1 is a member of Ulvaceae, family Ulvaceae, sea-lettuce family
    --1 has members: sea lettuce, laver
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