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Definition of thumbnail noun from the Oxford Advanced Learner's Dictionary

thumbnail

noun
 
/ˈθʌmneɪl/
 
/ˈθʌmneɪl/
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  1. the nail on the thumb
  2. (also thumbnail image)
    (computing) a very small picture on a computer screen that shows you what a larger picture looks like, or what a page of a document will look like when you print it
See thumbnail in the Oxford Advanced American Dictionary

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