nerd

US /nɚd/

UK /nɜ:d/

C2
n. (c./u.)Noun (Countable/Uncountable)Intelligent but single-minded expert in a field
People always came to me with questions because I was a math nerd
n. (c./u.)Noun (Countable/Uncountable)A person who is extremely enthusiastic about and knowledgeable about a particular subject, especially one of technical or scientific nature.
I'm such a history nerd; I could spend all day in a museum.

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