ˌpenəˈsilēəm noun
Etymology: New Latin, from Latin penicillus brush + New Latin -ium
1. capitalized : a genus of fungi (family Moniliaceae) comprising the blue molds found chiefly on moist nonliving organic matter (as decaying fruit), characterized by the erect branching conidiophores ending in tufts of club-shaped cells from which conidia are formed in chains, and including molds useful in economic fermentation — compare camembert cheese , penicillin
2. plural penicil·lia -ēə : any mold of the genus Penicillium