/ ˈænəræk; NAmE / noun
1.
( especially BrE ) a short coat with a hood that is worn as protection against rain, wind and cold
2.
( BrE , informal ) a person who spends a lot of time learning facts or collecting things that most other people think are boring
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WORD ORIGIN
1920s: from Greenland Eskimo anoraq . Sense 2 dates from the 1980s and derives from the anoraks worn by trainspotters, regarded as typifying this kind of person.