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Periodontal describes the parts of the mouth around the base of the teeth — the gums and the bone that hold the teeth in place. You will meet it most at the dentist: periodontal disease is gum disease, and a periodontist is the specialist who looks after that area. It is a medical word. Ordinary people just say “gums” (“I’ve got gum problems”). Though actually, it does not mean “about the teeth themselves.” The teeth are next to it; periodontal points to the tissue around them, at the root and the gum line.
牙周的（如牙周病、牙周科）
組成古希臘文 peri（周圍）+ odous（牙齒），所以是「牙齒周圍的」。
同家族的字
- orthodonticsshares the Greek odont- “tooth” piece; that field is about straightening teeth
- endodonticalso odont-: inside the tooth (root-canal work)
- perimetershares peri-: around
原始詞典資料3 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。
periodontaladj
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surrounding a tooth
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Relating to the periodontium
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Relating to periodontics
- Recently it has been shown that the bacterial flora of endodontic and periodontal abscesses differ in certain aspects. Thus, in an endodontic abscess, the number of spirochetes is between 0 and 10%, whereas in a periodontal abscess the spirochete count is about 40%.
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。