saprolegnia
/ˌsaprə(ʊ)ˈlɛɡnɪə
/noun [mass noun]
An aquatic fungus which can attack the bodies of fish and other aquatic animals.
- Genus Saprolegnia, subdivision Mastigomycotina.
Origin
Modern Latin, from sapro- 'of decay' + Greek legnon 'border'.