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Definition of endorphin

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perfunctory
Definition: (adjective) unenthusiastic, routine, or mechanical.
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< end organ

endorse >

en·dor·phin

(

n-dôr

n) KEY

NOUN:

Any of a group of peptide hormones that bind to opiate receptors and are found mainly in the brain. Endorphins reduce the sensation of pain and affect emotions.

ETYMOLOGY:
endo(genous) + (mo)rphin(e)

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