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hoary alyssum
Nounhoary alyssum has 1 sense
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 --1is a kind ofherb, herbaceous plant --1is a member of Berteroa, genus Berteroa