Seville orange

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

bigarade, bitter orange, bitter orange tree, Citrus aurantium, genus Citrus, marmalade orange, orange, orange tree, sour orange