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A biro is a pen with a tiny ball at the tip that rolls ink onto the paper — an ordinary pen. The name comes from László Bíró, who made the first that really succeeded in shops; in British English the brand name became the everyday word, the way some people say a brand name when they mean the whole type of thing. In American English you will hear far more. It is a school-bag word, informal to neutral, not a legal or technical term. In Taiwan nobody asks for a biro in a shop.
原子筆（英國口語；台灣說原子筆，中國大陸多說圓珠筆）
組成From the name of László Bíró, inventor of the first commercially successful ballpoint. A brand name that became a common noun.
原始詞典資料5 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。
Bironame
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A surname from the Slavic languages.
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A brand of ballpoint pen: see biro.
bironoun/ˈbaɪ.ɹəʊ/
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A Biro brand ballpoint pen.
- Biro MARKS A TURNING POINT IN THE HISTORY OF Writing "BIRO" is unique: it writes with a ballpoint — a point that never goes wrong, never floods, bends or splutters — a point that rolls your writing on to the paper with effortless ease. "BIRO" ink dries as you write; you cannot smudge it; you need no blotter. […] Retail price 55/- including purchase tax
- Frank's Biro taps delicately at the topmost of the little yellow notes.
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Any ballpoint pen.
- Massimo's finger was poised above red on his multi-coloured biro like a kangaroo frozen in headlights.
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Ink from a ballpoint pen.
- ‘My very creative 2-year-old son used my good friend′s white polyester Roman blinds as a canvas,’ says Jacqui. They′re now covered in blue biro. And although my friend isn′t too bothered by the biro, I am! Can you help?′
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。