uncoupler

noun
un·​cou·​pler | \ˈən-ˈkəp-(ə-)lər \

Medical Definition of uncoupler 

: an agent that dissociates two integrated series of chemical reactions especially : one that prevents the formation of ATP in oxidative phosphorylation in mitochondria by dissociating the reactions of phosphorylation from those concerned with electron transport and oxidation

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