single word requests - What is the term describing someone who has interest in only a narrow field, and nothing else?


There are some people who have interests in only some narrow field, and are not interested in anything else:



  • physicians who heal only ears, and for whom the stomach doesn't matter

  • clerks who know all the fiscal laws by heart, but ignore anything that isn't written there

  • fanatics who care only what the scriptures say

  • housewives interested only in cooking and soap operas

  • geeks who care only for computer games and comics

  • crazy scientists that know everything about chemistry but don't know who Columbus was and have probably never heard of America


What do I call someone who has such narrow-field interests and/or knowledge?




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