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penicillium pen·i·cil·li·um (pěn'ĭ-sĭl'ē-əm)
n. pl. pen·i·cil·li·ums or pen·i·cil·li·a (-sĭl'ē-ə)
Any of various bluish-green fungi of the genus Penicillium that grow as molds on decaying fruits and ripening cheese and are used in the production of penicillin.
A genus of fungi of the class Ascomycetes, some species of which yield several antibiotic substances and biologics.