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An electroencephalogram is the picture, or tracing, of the tiny electric signals your brain makes while it is working. Doctors put small sensors on the scalp, and the machine draws wavy lines that show how the brain is . In hospitals everyone just says EEG; almost nobody says the long word out loud. Though actually, EEG is used for two close things: this record on paper or on a screen, and the machine that makes it. The -gram word is the record — the thing you look at. People stretch it a little and say “I had an EEG” to mean the whole test, not only the printout. It is a medical, formal word; you meet it in hospitals, , and science class, not in everyday chat.
腦電圖（口頭常說腦波、做腦波；英文縮寫 EEG）
組成electro- (electricity) + encephalogram (a recording of the brain). encephalo- is the brain; -gram is a written record or picture.
同家族的字
- electroencephalographthe machine; -graph is the instrument, -gram is the picture it makes
- encephalogramthe same kind of brain recording, without naming the electric part
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。
electroencephalogramnoun/əˌlɛktɹoʊ.ənˈsɛfələˌɡɹæm/
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medicineneurologyneuroscienceA recording of electrical brain activity (brain waves) made by an electroencephalograph.
- Davide Valeriani, senior research officer at University of Essex’s BCI-NE Lab, is using an electroencephalogram (EEG)-based BCI to tap into the unconscious minds of people as they make decisions.
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。