from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An annual European herb (Berteroa incana) of the mustard family, having silvery foliage, oblong fruits, and deeply notched white flowers. It is naturalized in eastern North America. Also called alyssum.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. tall European annual with downy grey-green foliage and dense heads of small white flowers followed by hairy pods; naturalized in North America; sometimes a troublesome weed


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