Noun sea onion has 2 senses
  1. sea squill, sea onion, squill, Urginea maritima - having dense spikes of small white flowers and yielding a bulb with medicinal properties
    --1 is a kind of liliaceous plant
    --1 is a member of Urginea, genus Urginea
    --1 has parts: squill
  2. spring squill, Scilla verna, sea onion - European scilla with small blue or purple flowers
    --2 is a kind of scilla, squill
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