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

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

2. (noun) highly acidic orange used especially in marmalade

• bitter 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

2. (noun) highly acidic orange used especially in marmalade

• orange