IPA: /ˌæntiˈmaɪkroʊbiəl/
KK: /ˌæntiˈmaɪkroʊbiəl/
Able to kill or stop the growth of tiny living things like bacteria and fungi that can cause disease.
The doctor prescribed an antimicrobial medication to treat the infection.
Antimicrobial is formed from "anti-" (meaning against) and "microbium" (from Greek "mikros" meaning small and "bios" meaning life). The word describes substances that work against small life forms, particularly microorganisms that can cause disease.
Think of 'against' ('anti-') small 'life' ('microbium') — that's why antimicrobial refers to substances that fight against harmful microorganisms.