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endomorph
endonuclease
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endorphin

en·dor·phin [ en dáwrfin ] (plural en·dor·phins)


noun 
Definition:
 
natural painkiller: a substance in the brain that attaches to the same cell receptors that morphine does. Endorphins are released when severe injury occurs, often abolishing all sensation of pain.

[Late 20th century. Blend of endogenous + morphine]
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