endorphin

Definition / meaning of endorphin

One of several substances made in the body that can relieve pain and give a feeling of well-being. Endorphins are peptides (small proteins) that bind to opioid receptors in the central nervous system. An endorphin is a type of neurotransmitter.

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Source(s):

The Web site of the National Cancer Institute (http://www.cancer.gov/)

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