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| en·keph·a·lin [ en kéffəlin ] (plural en·keph·a·lins) |
noun |
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| Definition: |
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natural painkiller: either of two chemicals with opiate qualities that are secreted in the brain and spinal cord and act to relieve pain
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| [Mid-20th century. < Greek egkephalos "brain" (see encephalo-)] |
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