Definition of “thumbnail” - English Dictionary

“thumbnail” in American English

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thumbnailnoun [ C ]

us /ˈθʌmˌneɪl/

thumbnail noun [ C ] (ON FINGER)

the nail on the thumb

thumbnail noun [ C ] (SMALL PICTURE)

a small copy of a larger picture on a computer, shown in this way to allow more to be seen on the screen:

You can choose whether you would like to view your photos as thumbnails or in a slide show.
thumbnail images

thumbnailadjective [ not gradable ]

us /ˈθʌmˌneɪl/

thumbnail adjective [ not gradable ] (SMALL)

shorter or smaller than the usual length or size:

a thumbnail profile of the author
He gave a thumbnail sketch (= a short description) of life in Moscow in the 1960s.

(Definition of “thumbnail” from the Cambridge Academic Content Dictionary © Cambridge University Press)