noun Biochemistry.
either of two pentapeptides that bind to morphine receptors in the central nervous system and have opioid properties of relatively short duration; one pentapeptide (Met enkephalin) has the amino acid sequence Tyr-Gly-Gly-Phe-Met and the other (Leu enkephalin) has the sequence Tyr-Gly-Gly-Phe-Leu.

1970–75; < Greek enképhal(os) encephalon + -in2

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World English Dictionary
enkephalin or encephalin (ɛnˈkɛfəlɪn, ɛnˈsɛfəlɪn)
See also endorphin a chemical occurring in the brain, having effects similar to those of morphine
encephalin or encephalin

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Medical Dictionary

enkephalin en·keph·a·lin (ěn-kěf'ə-lĭn)
Either of two closely related pentapeptides having opiate qualities and occurring especially in the brain and spinal cord.

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