bactericidin

Etymology tree
Ancient Greek βακτηρία (baktēría)
Proto-Indo-European *-yósder.
Ancient Greek -ῐος (-ĭos)?
Ancient Greek -ιον (-ion)
Ancient Greek βακτήριον (baktḗrion)bor.
New Latin bactēriumbor.
English bacterium
Proto-Indo-European *kh₂eyd-der.
Proto-Italic *kaidō
Latin caedō
Proto-Indo-European *-h₂
Proto-Indo-European *-eh₂
Proto-Italic *-ā
Latin -a
Latin -cīdader.
Middle French -cidebor.
English -cide
English bactericide
Proto-Indo-European *-nós
Proto-Indo-European *-iHnos
Proto-Italic *-īnos
Latin -īnusder.
Old French -inbor.
Middle English -in
English -ineclip.
English -in
English bactericidin
From bactericide + -in.