Etymology
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endorphin (n.)

"chemical which occurs naturally in the brain and works like morphine," 1975, from French endorphine. First element from endogène "endogenous, growing within" (see endo- + genus); second element from morphine.

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Definitions of endorphin

endorphin (n.)
a neurochemical occurring naturally in the brain and having analgesic properties;
From wordnet.princeton.edu