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Noun: sour orange
  1. Any of various common orange trees yielding sour or bitter fruit; used as grafting stock
    - Seville orange, bitter orange, bitter orange tree, bigarade, marmalade orange, Citrus aurantium
  2. Highly acidic orange used especially in marmalade
    - bitter orange, Seville orange

Derived forms: sour oranges

Type of: orange, orange tree

Part of: genus Citrus

Encyclopedia: Sour orange