Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Any of various plant diseases caused by oomycetes and characterized by whitish gray patches of spores on the lower surfaces of leaves.
  • noun An oomycete causing such a disease.

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

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

Etymologies

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