scle·ro·tin·ia \ˌ ̷ ̷ ̷ ̷ˈtinēə\noun Etymology: New Latin, from sclerotin- (irregular from sclerotium) + -ia 1.capitalized: a large genus of ascomycetous fungi (order Helotiales) having apothecia that arise from a sclerotium and including various destructive plant pathogens — see brown rot 2.-s: any fungus of the genus Sclerotinia < sclerotinia rots > • scle·ro·tin·i·al\| ̷ ̷ ̷ ̷|tinēəl\adjective