endorphine
endorphin
noun ahn-dor-FEEN Rare
Origin: blend of 'endogenous' + 'morphine'
Usage Note
Endorphine is the French term for the brain's natural pain-relieving peptide, widely used in wellness and sports contexts. The plural endorphines is far more common, as the substance is discussed collectively — libérer des endorphines ('to release endorphins').
Examples
"Le sport libère des endorphines dans le cerveau."
Natural Translation
Exercise releases endorphins in the brain.

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