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Peronospora

noun
Per·​o·​nos·​po·​ra | \ ˌperəˈnäspərə\

Definition of Peronospora

: a genus (the type of the family Peronosporaceae) of destructive downy mildews having the sporangiophores dichotomously branched and with pointed tips — see onion mildew, tobacco blue mold

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History and Etymology for Peronospora

New Latin, from perono- + -spora

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