anorak
/ˈænəræk/noun
1- a waterproof jacket, typically with a hood, of a kind originally used in polar regions（原为极地用的）防水带兜帽夹克。
1.1
- Brit. informal, derogatory a socially inept and studious or obsessive person with unfashionable and largely solitary interests〈英, 非正式, 贬〉呆子。
词源
1920s: from Greenland Eskimo anoraq. The British English informal sense dates from the 1980s and derives from the anoraks worn by trainspotters， regarded as typifying this kind of person.