1. Antibiotic: A substance that kills or inhibits the growth of bacteria.
2. Antisocial: Disliking or avoiding the company of other people.
3. Antitoxin: A substance that counteracts a toxin.
4. Antitrust: Relating to laws designed to prevent monopolies and unfair business practices.
5. Antidote: A remedy to counteract the effects of a poison or disease.