1. The boundary between Maryland and Pennsylvania; symbolic dividing line between North and South before the American Civil War
   - Mason-Dixon line, Mason and Dixon's line

Type of: state boundary, state line

• quinch
• Quincke's edema
• quincunx
• Quincy
• Quine
• quinella
• Quinidex
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• quinine water
• quinnat salmon
• quinoa
• quinol
• quinoline
• quinone
• Quinora
• Quinquagesima
• Quinquagesima Sunday
• toner
• tong
• tong ho
• Tonga
• Tongan
• Tongan monetary unit
• tongs