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A thumbnail is literally the nail on your thumb. But the common use today is different: a thumbnail is a small picture, often a small version of a bigger photo or video image, used so you can look at many pictures quickly before choosing one — like the thumbnails you see under a YouTube video.
縮圖（小圖示）；（原意）拇指指甲
原始詞典資料6 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。
thumbnailnoun/ˈθʌm.neɪl/
- 1
The fingernail on the thumb.
- 2
A rough sketch (e.g., the size of one's thumbnail).
- 3
computingengineeringmathematicsA small picture, used as a compact representation of a larger image.
- 4
A small picture representing a post or a video in a list.
thumbnailverb/ˈθʌm.neɪl/
- 1
To describe concisely.
- 2
computingengineeringmathematicsTo create a smaller representation of (a larger image).
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。