köken: Siyokoy word or pseudo-Hispanism derived from English pesticide, from pest + -i- + -cide. Created under a false assumption Spanish has *pesticidio (correct Spanish: pesticida, expected *pestisida).
Etymology tree Latin pestis 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. Polish -cyd Polish pestycyd From Latin pestis (“pest”) + Polish -cyd.