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A filbert is a : the small, round, brown nut with a hard shell. In many places, especially among Oregon growers in the US and in older British English, filbert and name the same food. Some people once kept a split — filbert for the cultivated nut, for the wild one — but most speakers do not bother now. You will also hear it for the tree. The word feels a bit old or regional; many English packets just say . In Taiwan you will almost always meet the nut as 榛果. If you see filbert on an English bag, think .
榛果（台灣一律這樣叫；filbert 是較舊或產地的英語說法）
組成Older English said filbert-nut or Philibert-nut, from Anglo-Norman noix de filbert. People named the nut after Saint Philibert, because the nuts are ripe near his feast day.
原始詞典資料4 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。
Filbertname
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A surname.
filbertnoun/ˈfɪlbət/
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The hazelnut.
- I'll bring thee / To clust'ring filberts, and sometimes I'll get thee / Young scamels from the rock.
- I've seen one monkey force open the jaws of his brother, resolutely introduce his fingers, pluck from the sanctuary of his cheek the filbert he had just stowed there for his private nutrition and delight, and crunch and eat it with a stern ecstasy of selfishness, himself […]
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The hazel tree.
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A paintbrush used in oil and acrylic painting with a long ferrule and a curving, tongue-shaped head.
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。