canister
/ˈkænɪstə(r)/noun
1- a round or cylindrical container, typically one made of metal, used for storing such things as food, chemicals, or rolls of film（尤指装食物、化学制品或胶卷的金属）圆筒, 圆罐。
1.1
- a cylinder of pressurized gas, typically one that explodes when thrown or fired from a gun（尤指掷出或用枪发射而爆炸的）加压气体圆筒：
riot police fired tear-gas canisters into the crowd.
防暴警察向人群发射催泪弹。
1.2
- mass noun historical small bullets packed in cases that fit the bore of a gun〈史〉榴霰弹：
another deadly volley of canister.
又一阵致命的榴霰弹。
词源
late 15th cent. (denoting a basket)： from Latin canistrum, from Greek kanastron 'wicker basket'， from kanna 'cane， reed' （see CANE）.