1. Highly acidic orange used especially in marmalade
   "She made marmalade from Seville oranges";
   - bitter orange, sour orange
    
2. Any of various common orange trees yielding sour or bitter fruit; used as grafting stock
   "They made traditional marmalade from Seville oranges";
   - sour orange, bitter orange, bitter orange tree, bigarade, marmalade orange, Citrus aurantium

Derived forms: Seville oranges

Type of: orange, orange tree

Part of: genus Citrus

Encyclopedia: Seville orange