as·per·gil·lin noun \ˌas-pər-ˈjil-ən\
: an amorphous black pigment found in the spores of various fungi of the genus Aspergillus
: an antibacterial substance isolated from two molds of the genus Aspergillus (A. flavus and A. fumigatus) and reported to possess activity against both gram-positive and gram-negative bacteria
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