WordReference Random House Unabridged Dictionary of American English © 2020
Lewis gun′, 
  • Militarya light, air-cooled, gas-operated machine gun with a circular magazine, first used in World War I. Also called  Lewis automatic, Lewis machine gun′. 
    • named after I. north, northern. Lewis 1910–15

    Collins Concise English Dictionary © HarperCollins Publishers::
    Lewis gun n
    1. a light air-cooled drum-fed gas-operated machine gun used chiefly in World War I
    Etymology: 20th Century: named after I. N. Lewis (1858–1931), US soldier
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