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Etymology and terminology

The word cannon is derived from the Old Italian word cannone, meaning "large tube", which came from the Latin canna, in turn originating from the Greek κάννα (kanna), "reed", and then generalised to mean any hollow tube-like object. The word has been used to refer to a gun since 1326 in Italy and 1418 in England. Both of the plural forms cannons and cannon are correct.