endorphin - WordReference.com Dictionary of English

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endorphin

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Concise Oxford English Dictionary © 2008 Oxford University Press:
endorphin /ɛnˈdɔːfɪn/

▶noun Biochemistry any of a group of peptides and polypeptides secreted in the body and activating the opiate receptors, causing an analgesic effect.

– origin 1970s: blend of endogenous and morphine.

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