anorak
🇺🇸
/ˈænəræk/
🇬🇧
/ˈænəræk/
A waterproof jacket with a hood, typically worn for outdoor activities in bad weather.
I always carry an anorak when I go hiking, just in case it starts to rain.
A person who is very interested in a particular subject, often to the point of being considered a nerd or geek.
He's such an anorak about trains; he knows every detail about them.