IPA: //bækˈtɪrɪˌsaɪdəl//
KK: /bækˌtɪrɪˈsaɪdəl/
Relating to substances that kill bacteria.
The new disinfectant is bacteriocidal and effective against a wide range of germs.
Bacteriocidal is formed from "bacterium" (from Greek "bakterion", meaning rod or staff, referring to the shape of bacteria) and "-cidal" (from Latin "caedere", meaning to kill). The word describes something that kills bacteria.
Think of 'bacterium' as referring to the tiny organisms and '-cidal' meaning to kill — together, they describe something that kills bacteria.
No commonly confused words.