prop. n. A genus of destructive downy mildews. Syn. -- genus Peronospora. [ WordNet 1.5 ]
prop. n. A natural family of parasitic fungi; the downy mildews. Syn. -- family Peronosporaceae. [ WordNet 1.5 ]
prop. n. An order of chiefly parasitic lower fungi, including the Albuginaceae and Peronosporaceae and Pythiaceae. Syn. -- order Peronosporales. [ WordNet 1.5 ]