Ma·son-Dix·on Line 
(māsən-dĭksən)
(māsən-dĭksən) A line marking the boundary between the colonies of Pennsylvania and Maryland, established between 1763 and 1767 by the British surveyors Charles Mason (1730-1787) and Jeremiah Dixon (1733-1779). It was regarded as the division between free and slave states before the Civil War.
Mason-Dixon LineThe original line extended from the southeast corner of the colony of Pennsylvania 233 miles west and 82 miles south.
- repentance
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- repercussion
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- repertorial
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- repetition
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- repetitive strain injury
- rephrase
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- replace