Definition of penicillium
plural penicillia
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\ˌpe-nə-ˈsi-lē-ə\
:any of a genus (Penicillium) of fungi (such as a blue mold) that are found chiefly on moist nonliving organic matter (such as decaying fruit) and have been grouped with the imperfect fungi but are now often placed with the ascomycetes
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