The word "anorak" is a type of winter coat that keeps you warm. It can also refer to someone who is very interested in a particular subject and knows a lot about it. Full definition
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Hooded Anorak Jacket Back Zip Pullover Sweater Gibson Tie Front Fleece Pullover Leith Stretch Midi Dress (middleofsomewhereblog.com)
The day that I left for France this summer, I ran to Uniqlo and picked up a longish, hooded twill anorak in army green. (unefemme.net)