This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. One involved in a struggle or competition.

n. Physiology A contracting muscle that is resisted or counteracted by another muscle, the antagonist.

n. Biochemistry A drug or other chemical that can combine with a receptor on a cell to produce a physiologic reaction typical of a naturally occurring substance.

n. Someone involved in a contest or battle (as in an agon).

n. The muscle that contracts while the other relaxes.

n. A molecule that can combine with a receptor on a cell to produce a physiological reaction.

n. One who contends for the prize in public games.

n. One who contends for the prize in public games; a combatant; a champion; a dramatic actor. Also called agonister.

n. [capitalized] One of a violent party of Donatists in northern Africa in the fourth century.

n. a muscle that contracts while another relaxes

n. someone involved in a contest or battle (as in an agon)

n. the principal character in a work of fiction

n. (biochemistry) a drug that can combine with a receptor on a cell to produce a physiological reaction

"In Western anatomy, these are called agonist and antagonist muscle groups, but I call them balancing muscle groups."

antagonistic muscle    contestant    drug   

agonistics    protagonist    agonistical    antagonist   

reuptake    d2    5-ht1d    subtype    depressant    bispidine    blocker    receptors    antagonist    denervation