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A demijohn is a big glass bottle with a fat body and a short narrow neck. People use it for making wine at home, or for keeping and pouring a lot of liquid. It often sits in a basket or a straw coat so the glass does not smash. The name looks like demi- (“half”) plus John, as if it were a small bottle named after a man. That is the story the English spelling tells, not the truth. It comes from French dame-jeanne, “Lady Jane.” English borrowed the name in a twisted way and turned Jeanne into John, the masculine form, instead of Jane. Nobody is sure where the French name itself began. And though actually, a demijohn is large, not half-size. Trust the bottle you can see, not the John in the spelling.
細頸大肚瓶（釀酒用）
組成A partial calque of French dame-jeanne, literally “Lady Jane.” French Jeanne became English John. The French name’s own origin is uncertain.
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。
demijohnnoun/ˈdɛmɪdʒɒn/
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A large bottle with a short neck, sometimes with two small handles at the neck, sometimes encased in wickerwork.
- “Reckon it's first-drink time,” the old prospector cried cheerily, and unearthed Monica's two-gallon demijohn.
- Toby, placing his gold-rimmed spectacles on his nose, set our dinner to simmer and uncorked a demijohn of the old Verfeuille red which glowed in our glasses with the embers of old recollections of half-forgotten journeys and excursions of our youth by the light of the moon.
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。