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A cardiologist is a doctor whose work is the heart — and often the blood vessels around it. If you have chest pain, a heartbeat that will not stay steady, or blood pressure that needs more than a family doctor, you may be sent to a cardiologist. The word is ordinary in hospitals; patients also just say heart doctor. Though actually, this is usually not the doctor who cuts the heart open. That is a cardiac surgeon. A cardiologist mostly runs tests, names the problem, and treats it with medicine or with procedures that do not mean open surgery. Nothing to do with playing cards.
心臟科醫師（開刀的多半是心臟外科醫師）
組成From cardio- + -logist. cardio- is “heart” (from Greek kardía); -logist is the person who studies or practises that field.
同家族的字
- cardiologythe medical field this doctor works in; same cardio- plus -logy
- cardiacsame cardi- / cardio-, “heart”
- cardiovascularsame cardio- plus vascular, “heart and blood vessels”
- cardiothe same heart prefix, shortened in gym talk
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。
cardiologistnoun/ˌkɑːdiˈɒlədʒɪst/
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A physician who specializes in medical problems related to the heart.
- The homeless guy thus ends up getting treated by one of the best cardiologists in the city.
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。