IPA: //ˌbaɪoʊˈsaɪdəl//
KK: /baɪˈoʊˌsaɪdəl/
Able to kill living organisms, particularly small ones like bacteria and fungi.
The biocidal properties of the chemical make it effective in disinfecting surfaces.
Biocidal → It is formed from "bio-" (from Greek "bios", meaning life) and "cidal" (from Latin "caedere", meaning to kill). The word "biocidal" refers to something that kills living organisms.
Think of 'life' ('bio-') being affected by something that 'kills' ('cidal') — that's why biocidal means something that kills life.