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A protuberance is a bulge: something that swells out from a surface, usually in a rounded way. Think of a knot on a tree, a bump on a bone, or a swelling under the skin. It is close to protrusion, and people do mix them — though actually protuberance leans toward a lump or a swelling, not a sharp point sticking out. You will meet it in biology, medicine, and careful description. It is not a casual word. You would not usually tell a friend about “a protuberance on my arm” unless you were joking in a doctor voice.
隆起；突起物（較像圓圓鼓起的一塊，不是尖尖戳出來的）
組成From French protubérance, from Latin prōtubērantia: prō- (forward) + tūber (swelling, lump) + -antia (the -ance ending that makes a noun).
同家族的字
- protuberantthe adjective from the same Latin protuberare
- tuberfrom the same Latin tūber, “swelling, lump”
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。
protuberancenoun/pɹəˈtjuː.bə.ɹəns/
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A bulge, knob, swelling, spine, or anything that protrudes.
- For the most part they were small standard gauge 0-6-0 side tanks of the type illustrated, with long tapered chimneys and an unusual feature for the Continent in the shape of domeless boilers, the protuberance just behind the chimney being a sandbox.
- Oluanpi's lighthouse looks toward Lanyu, or Orchid Island, a tiny, rocky protuberance sixty-eight miles to the southeast and important because it is the home of the Yami, the smallest and most primitive tribe of aborigines in Taiwan.
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。