Agonistics :: Agonistics (n.) The science of athletic combats, or contests in public games..
Antagonist :: Antagonist (n.) One who contends with another, especially in combat; an adversary; an opponent..
Antagonist :: Antagonist (n.) A muscle which acts in opposition to another; as a flexor, which bends a part, is the antagonist of an extensor, which extends it..
Antagonist :: Antagonist (n.) A medicine which opposes the action of another medicine or of a poison when absorbed into the blood or tissues.
Antagonistical :: Antagonistical (a.) Opposing in combat, combating; contending or acting against; as, antagonistic forces..
Protagonist :: Protagonist (n.) One who takes the leading part in a drama; hence, one who takes lead in some great scene, enterprise, conflict, or the like..