Webster's English Dictionary

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penicillium

pen.i.cil.li.um \-'sil-e--*m\ \-e--*\ n or pen.i.cil.lia [NL, genus name, 
   fr. L penicillus] pl  : any of a genus (Pencillium) of fungi (family 
   Moniliaceae) comprisi ng the blue molds found chiefly on moist nonliving 
   organic matter