The story
Named after English astronomers Charles Mason (1728–1786) and Jeremiah Dixon (1733–1779).
Etymology from Wiktionary, CC BY-SA 4.0.
Mason-Dixon Line
Today it means: The boundary line between Pennsylvania and Maryland, as run (1764–1767) by Charles Mason and Jeremiah Dixon, that, before abolition, defined part of the northern boundary of states in which slavery was permitted. Full definition →