Noun hoary alison has 1 sense
  1. hoary alison, hoary alyssum, Berteroa incana - tall European annual with downy gray-green foliage and dense heads of small white flowers followed by hairy pods; naturalized in North America; sometimes a troublesome weed
    --1 is a kind of herb, herbaceous plant
    --1 is a member of Berteroa, genus Berteroa
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