bitter orange

/ˌbɪdər ˌɔrəndʒ/

Other forms: bitter oranges

Definitions of bitter orange

1. noun

   any of various common orange trees yielding sour or bitter fruit; used as grafting stock
   synonyms: Citrus aurantium, Seville orange, bigarade, bitter orange tree, marmalade orange, sour orange

   type of:

   orange, orange tree

   any citrus tree bearing oranges
2. noun

   highly acidic orange used especially in marmalade
   synonyms: Seville orange, sour orange

   type of:

   orange

   round yellow to orange fruit of any of several citrus trees