Ma'anar ƙamus na "toxin botulinum" (wanda aka fi sani da botulinus toxin) wani sunadari ne mai guba mai matuƙar guba da ƙwayoyin cuta Clostridium botulinum ke haifarwa da ke haifar da botulism, ciwo mai wuya amma mai tsanani wanda ke da rauni na tsoka da gurguzu. Dafin na iya zama mai kisa idan aka sha shi da yawa, amma kuma ana amfani da shi ta hanyar warkewa a cikin ƙananan allurai don magance cututtuka daban-daban, kamar ciwon tsoka, yawan gumi, da wasu nau'in ciwon kai. Nau'in maganin dafin an fi saninsa da Botox, wanda shine alamar sunan botulinum toxin type A.