One who antagonizes or stirs.
An opponent or enemy.
A muscle that acts in opposition to another.
A chemical that binds to a receptor but does not produce a physiological response, blocking the action of agonist chemicals.
The main character or force opposing the protagonist in a literary work or drama.
A person who assists or helps someone else.
A software tool that provides assistance in some task, a wizard program.
Sales assistant.
Helping; lending aid or support; auxiliary.
Having a subordinate or auxiliary position.