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Noun cotton grass has 1 sense
  1. cotton grass, cotton rush - any sedge of the genus Eriophorum; north temperate bog plants with tufted spikes
    --1 is a kind of sedge
    --1 is a member of Eriophorum, genus Eriophorum
    --1 has particulars: common cotton grass, Eriophorum angustifolium
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