anorak
US /ˈæn.ə.ræk/
UK /ˈæn.ə.ræk/
1.
a waterproof jacket, typically with a hood and a drawstring at the waist and cuffs
:
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He zipped up his anorak as the rain started.
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She wore a bright red anorak for her hike.
2.
a person who has a very strong interest, perhaps an obsessive one, in a particular hobby or subject
:
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He's a real train anorak, he knows every model and route.
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The convention was full of computer anoraks discussing the latest tech.