exotoxin

Etymology tree
Proto-Indo-European *h₁éǵʰ
Proto-Indo-European *-s
Proto-Indo-European *h₁eǵʰs
Proto-Hellenic *eks
Ancient Greek ἐκ (ek)
Ancient Greek ἔξω (éxō)der.
English exo-
Ancient Greek τόξον (tóxon)
Proto-Indo-European *-kos
Ancient Greek -κός (-kós)
Ancient Greek -ῐκός (-ĭkós)
Ancient Greek τοξῐκός (toxĭkós)
Ancient Greek τοξικόν (toxikón)der.
Latin toxicum
Proto-Indo-European *-nós
Proto-Indo-European *-iHnos
Proto-Italic *-īnos
Latin -īnusder.
Old French -inbor.
Middle English -in
English -ineclip.
English -in
English toxin
English exotoxin
From exo- + toxin.