Definition of nerd noun from the Oxford Advanced American Dictionary

     

    nerd

     noun
    noun
    NAmE//nərd//
     
    (informal)(disapproving)
     
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  1. 1a person who is boring, uncomfortable in social situations, and not fashionable I feel like a nerd in these shoes.
  2. 2a person who is very interested in computers synonym geek
 
adjective He looked kind of nerdy.
See the Oxford Advanced Learner's Dictionary entry: nerd