- (especially, of an object) The state of abutting.
- (biology) Any chemical or agent which regulates one or more genes by increasing the rate of transcription.
- One who, or that which, activates.
- An opponent or enemy.
- One who antagonizes or stirs.
- (biochemistry) A chemical that binds to a receptor but does not produce a physiological response, blocking the action of agonist chemicals.
- 2001: The calcium antagonists represent one of the top ten classes of prescription drugs in terms of commercial value, with worldwide sales of nearly $10 billion in 1999. " Leslie Iversen, Drugs: A Very Short Introduction (Oxford 2001, p. 41)