I. an ‧ ti ‧ sep ‧ tic 1 /ˌæntəˈseptɪk◂, ˌæntɪˈseptɪk◂/ BrE AmE noun [uncountable and countable]
a medicine that you put onto a wound to stop it from becoming infected:
He dabbed the cut with antiseptic.
Mint is a mild antiseptic.
II. antiseptic 2 BrE AmE adjective
helping to prevent infection:
an antiseptic cream
Some herbs have antiseptic qualities.