柯林斯詞典poison gas 1. N-UNCOUNT Poison gas is a gas that is poisonous and is usually used to kill people in war or to execute criminals. 毒氣 返回 poison gas劍橋詞典a gas that is used to kill people , especially in a war （尤指戰(zhàn)爭(zhēng)中使用的）毒氣 返回 poison gas