Meaning of ANTAGONIST in English

ANTAGONIST

transcription, транскрипция: [ -nist ]

noun

Date: 1575

1. : one that contends with or opposes another : adversary , opponent

2. : an agent of physiological antagonism: as

a. : a muscle that contracts with and limits the action of an agonist with which it is paired — called also antagonistic muscle

b. : a chemical that acts within the body to reduce the physiological activity of another chemical substance (as an opiate) ; especially : one that opposes the action on the nervous system of a drug or a substance occurring naturally in the body by combining with and blocking its nervous receptor — compare agonist 2b

Merriam-Webster's Collegiate English vocabulary.      Энциклопедический словарь английского языка Merriam Webster.