Definition of thumbnail noun from the Oxford Advanced American Dictionary

     

    thumbnail

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

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