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 ■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)加压气体圆桶 riot police fired tear-gas canisters into the crowd. 防暴警察向人群发射催泪弹。 ■[mass noun](historical)small bullets packed in cases that fit the bore of a gun (史)榴霰弹 another deadly volley of canister. 又一阵致命的霰弹。
语源
late 15th cent. (denoting a basket): from Latin canistrum, from Greek kanastron 'wicker basket', from kanna 'cane, reed' (see cane)