Dafi ko kuma Guba ana kiran dafi da turanci poison/venom dai kamar yadda masu ilimin biology suka bayyana yana nufin duk wani abinda yakeda haɗari wanda har zai iya sabbaba mutuwa ko jin rauni ko raunata wasu sassan jikin Ɗan Adam, misali gaɓoɓi koda kuwa dabbace ko kuma ɓata baki ɗayan jiki. Dafi yana samuwa ne kodai ta hanyar sara/cizon wani dabba misali maciji, ko kuma harbin kunama da ƙarinta (by sting or bite) sai dai shi dafin dabbar da take cizo yasha banban da sauran waɗansu dafin kasancewa shi ta sanadiyyar cizo ne ko harbi kalan wannan dafin na dabbobi ana kiranshi da Turanci da (Venoms) Ga jerin su da harshen turanci kamar haka kowane tare da bayaninshi: Necrotoxins kalan wannan dafin/gubar yana kashe ƙwayoyin halittar bil'adama idan ya samu mutum Cytotoxins shima duka illar shi ɗaya daga Necrotoxins Neutrotoxins shi kuma yana taɓa ɓangaren hankali (Nervous system) a turance kenan Myotoxins shi kalan wannan gubar tana lalata tsokar jiki Hemotoxins shi kuma yana tasiri ne a jinin mutum Dafi ko kuma guba yanada matuƙar haɗari ga duk wani mai rai kamar yadda ya gabata akan cewa kodai yayi sanadiyar mutuwar mai rai ko kuma ya lalata masa wasu gaɓoɓi.