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Your body can make a chemical that quiets pain and can lift your mood. That chemical is an endorphin. It often shows up when you are hurt, when you run or train hard for a long time, or even when you laugh a lot. People talk about an "endorphin high" after sport — a light, warm feeling that comes when the pain of the effort . Though actually, calling it "the happy chemical" is a bit loose. Your body has several chemicals that change how you feel; endorphins are the ones that mainly take the edge off pain, a little like a pain medicine the body makes for itself. You hear the word in sport, in health class, and in everyday talk. It is not slang, but it is not only a doctor's word either.
內啡肽（口語有人籠統說「快樂賀爾蒙」，但其實那也包括多巴胺等）
組成Borrowed from French endorphine, built from endo- (from endogène, "made inside the body") and morphine. Doctors chose that shape because this chemical quiets pain a little like morphine, but the body makes it itself.
同家族的字
- morphinethe second half of the name; endorphins quiet pain a little like this medicine
- endogenousshares endo-, "produced inside the body"
原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
endorphinnoun/ɛnˈdɔːfɪn/
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biochemistrybiologychemistryAny of a group of peptide hormones found in the mammalian brain that act as neurotransmitters and have properties similar to morphine.
- The explanation for the depression-reducing effects of exercise that clearly has been the most popular with the media is the endorphin hypothesis (see Hoffmann, 1997), which has also been discussed as a possible explanation in nearly every exercise-depression literature review.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。