AGONIST - Definition

Pronunciation:		'agunist
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WordNet Dictionary

	Definition:	[n] a muscle that contracts while another relaxes

	See Also:	antagonistic muscle

Webster's 1913 Dictionary

	Definition:	\Ag"o*nist\, n. [Gr. ?.] One who contends for the prize in public games. [R.]

Medical Dictionary

	Definition:	a drug capable of combining with receptors to initiate an action that can be known in advance.

Biology Dictionary

	Definition:	Any molecule that improves the activity of a different molecule; e.g., a hormone, which acts as an agonist when it binds to its receptor, thus triggering a biochemical response. A drug that both binds to receptors and has an intrinsic effect.