1. (noun) any of various common orange trees yielding sour or bitter fruit; used as grafting stock

• bitter orange
• bitter orange tree
• citrus aurantium
• marmalade orange
• seville orange
• sour orange

1. (noun) any of various common orange trees yielding sour or bitter fruit; used as grafting stock

• genus citrus

1. (noun) any of various common orange trees yielding sour or bitter fruit; used as grafting stock

• orange
• orange tree