Definition of Peronospora in US English:

Peronospora

(also Peronosporos)

noun

Mycology
  • A genus of fungal plant pathogens of the order Peronosporales, having sporangia borne on the tips of dichotomously branched sporangiophores and causing highly destructive plant diseases (downy mildews); (also in form peronospora) a fungus of this genus.

Origin

Mid 19th century; earliest use found in Jabez Hogg (1817–1899), ophthalmic surgeon. From scientific Latin Peronospora from ancient Greek περόνη + σπόρος.

Pronunciation

Peronospora

/ˌpɛrə(ʊ)ˈnɒsp(ə)rə/