Definition of phytophthora
1 capitalized : a genus of destructive parasitic fungi (family Pythiaceae) having conidia that usually act as sporangia especially under moist cool conditions and sporangiophores that are simple or branched — see late blight, pythiacystis
2 plural -s a : any fungus of the genus Phytophthora b : a disease (as late blight) caused by such a fungus
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Origin and Etymology of phytophthora
New Latin, from phyt- + -phthora
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