名詞 enkephalin:

1. an endorphin having opiate qualities that occurs in the brain and spinal cord and elsewhere

en.keph.a.lin

n.（名詞）
Either of two closely related pentapeptides having opiate qualities and occurring in the brain, spinal cord, and other parts of the body.
腦啡肽：兩種緊密相關(guān)的五肽中任何一種，具有麻醉鎮(zhèn)靜作用，在大腦、脊髓及身體其它部分發(fā)生作用

來源：
Greek enkephalos [in the head] en- [in] * see en kephalô [head] * see ghebh-el-
希臘語 enkephalos [位于頭部] en- [在…里] *參見 en kephalô [頭] *參見 ghebh-el-
-in
-in