Mason and Dixon's line

Variant of Mason-Dixon line

Mason-Dixon line definition

Mason-Dixon line (mā′sən dik′sən)

boundary line between Pa. & Md., regarded, before the Civil War, as separating the free states from the slave states or, now, the North from the South
also Mason and Dixon's line

Etymology: after C. Mason & J. Dixon, who surveyed it, 1763-67

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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