Epsilon toxin wani guba ne na furotin da ƙwayar cuta mai suna Clostridium perfringens ke samarwa, wanda ke haifar da mummunan nau'in guba na abinci ga dabbobi da mutane. Kalmar “epsilon” ta samo asali ne daga harafin Helenanci ε (epsilon), wanda shine harafi na biyar na haruffan Helenanci kuma galibi ana amfani da shi don nuna ƙarami ko ƙarancin ƙima. Saboda haka, "epsilon toxin" yana nufin wani guba da ke cikin ƙananan adadi kuma yana da tasiri mai karfi a jiki.