Lewis gun
noun
- chiefly historical a light air-cooled machine gun with a magazine operated by gas from its own firing, used mainly in the First World War〈主史〉刘易斯机枪（气冷式轻机枪, 弹盒由射击时产生的气体推动, 主要用于一战中）。
词源
early 20th cent.: named after its inventor， Isaac N. Lewis （1858-1931）， a colonel in the US army.