If something is refillable, you can fill it again after it is empty. The action is to fill it again; this word names the kind of thing that allows that — a water bottle, a pen, a lighter, a gas tank. You do not throw it away when it runs out; you put more in. Shops like the word because it sounds less wasteful. Though actually, refillable is usually an adjective (a refillable bottle). The everyday action word is refill: please refill my cup. As a noun, a refillable can mean a container made to be filled again, but that use is less common than the adjective.

可再填充的、可重複填充的