IPA: //bækˈtɪəriəˌsaɪd//
KK: /bækˈtɪrɪəˌsaɪd/
A substance that kills bacteria, often used in medical or agricultural settings to eliminate harmful microorganisms.
The hospital uses a strong bacteriocide to disinfect the surgical instruments.
Bacteriocide is formed from "bacterium" (from Greek "bakterion", meaning rod or staff, referring to the shape of certain bacteria) and "-cide" (from Latin "caedere", meaning to kill). The word describes a substance that kills bacteria.
Think of 'bacterium' as referring to the tiny organisms and '-cide' meaning to kill, so a bacteriocide is something that kills bacteria.
No commonly confused words.