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penicillium

pen·i·cil·li·um [ pènni síllee əm ]


noun 
Definition:
 
bluish green mold: a bluish green fungus that grows on stale or ripening food. Use: in cheese-making, as a source of penicillin. Genus Penicillium.

[Mid-19th century. < modern Latin< Latin penicillus "paintbrush" < peniculus (see pencil)]
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