any of several toxic or carcinogenic substances produced by a fungus (esp. Aspergillus flavus) found on peanuts, corn, etc.
See aflatoxin in American Heritage Dictionary 4
(ăfˌlə-tŏkˈsĭn)
noun
Any of a group of toxic compounds produced by certain molds, especially Aspergillus flavus, that contaminate stored food supplies such as animal feed and peanuts.