IPA: /ˈkloʊzəbl/
KK: /ˈkloʊzəbl/
Able to be shut or sealed.
The closeable window helps keep the room warm during winter.
Closeable → It is formed from "close" (from Old French *clore*, meaning to shut or enclose) and "-able" (meaning capable of). The word "closeable" means capable of being shut or enclosed.
Think of something that is 'capable of being shut' — 'close' means to shut, and '-able' indicates the ability to do so.