antagonist
B2CEFR level
35/100Rarity: fairly common
TechnicalRegister
A substance that binds to a receptor without activating it, thereby blocking the action of an agonist.
Naloxone is a competitive antagonist that displaces opioids from their receptors to reverse respiratory depression.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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