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For other meanings, see Slug (disambiguation)
A slug is a solid ballistic projectile, often fired from a shotgun. A term derived from this is slug-flow, which is a way in which a gas/liquid mixture can flow through a pipe. The liquid forms a series of slugs occupying the full diameter of the pipe but separated from eachother by large bubbles.
A slightly different meaning from the last definition is the slug that is a bullet that has been reduced in diameter, or has become deformed, by passing from a larger to a smaller part of the bore of the barrel.