a container with a lid (= cover) for holding tea, coffee, etc. （装茶叶、咖啡等有盖的）小罐 a strong metal container containing gas or a chemical substance, especially one that explodes or bursts (= breaks open) when it is fired from a gun or thrown 霰弹筒 Police fired tear-gas canisters at the demonstrators. 警方向示威者发射催泪弹。
a flat, round metal container used for storing film （用以放置胶片的）扁平圆金属盒 a film canister 胶片盒
Word Originlate 15th cent. (denoting a basket): from Latin canistrum, from Greek kanastron ‘wicker basket’, from kanna ‘cane, reed’ kannē, of Semitic origin.