plural noun
Per·​o·​nos·​po·​ra·​les | \ˌperəˌnäspəˈrā(ˌ)lēz\

Definition of Peronosporales 

: an order comprising chiefly parasitic lower fungi (subclass Oomycetes) that have equally biflagellate zoospores and conidia which either germinate directly or act as sporangia and contain the families Albuginaceae, Peronosporaceae, and Pythiaceae

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History and Etymology for Peronosporales

New Latin, from Peronospora + -ales

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