Supergun meaning

so͝o'pər-gŭn'
An extremely large, cannonlike gun designed to shoot projectiles over long distances or to launch satellites and spacecraft into orbit without a propulsion or guidance system, as is needed with a missile.
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A very large cannon with an extremely high muzzle velocity and large bore.
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Origin of supergun

  • super- +"Ž gun
    From Wiktionary