A substance that destroys micro-organisms that carry disease without harming body tissues WordNet 3.0 & Open English WordNet

An antiseptic is an antimicrobial substance or compound that is applied to living tissue to reduce the possibility of sepsis, infection or putrefaction. Wikipedia

A principal type of antimicrobial agent used mainly against bacteria; it may kill or inhibit them Wikipedia Disambiguation

Antimicrobial substance used to destroy germs causing disease, on skin or other tissue of a living being Wikidata

Any substance that inhibits the growth and reproduction of microorganisms. Generally includes only those that are used on living objects (as opposed to disinfectants) and aren't transported by the lymphatic system to destroy bacteria in the body (as opposed to antibiotics). Wiktionary

Substance that inhibits the growth of microorganisms. Wiktionary (translation)