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

  • n. A disease of plants caused by fungi of the order Peronosporales and characterized by gray, velvety patches of spores on the lower surfaces of leaves.

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

  • n. any of various fungi of the family Peronosporaceae parasitic on e.g. grapes and potatoes and melons


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