Definition

Noun: 1. A type of orange with a highly acidic, sour, or bitter taste, primarily used in cooking, especially for making marmalade. 2. The tree that produces this fruit, scientifically classified as Citrus × aurantium. It is often used as a hardy rootstock for grafting other citrus trees.

Usage and Examples

• Referring to the fruit:
  • The recipe calls for two sour oranges to give the marmalade its characteristic tang.
  • Unlike sweet oranges, sour oranges are rarely eaten raw due to their sharp flavor.
• Referring to the tree:
  • The sour orange tree in the garden is more resistant to cold than the lemon tree.
  • Many commercial citrus groves use sour orange as grafting stock for its strong root system.

Advanced Usage

• In botanical or agricultural contexts: The term is used precisely to distinguish this specific species () from the sweet orange (). It may be referred to by other common names like "bitter orange" or "Seville orange."

Variants and Related Words

• Bitter orange: A common synonym for "sour orange," emphasizing the bitter flavor component.
• Seville orange: A specific, well-known variety of sour orange traditionally used for marmalade.
• Bergamot orange: A related citrus variety () prized for its aromatic peel, distinct from the common sour orange.
• Citrus × aurantium: The scientific Latin name for the sour orange tree.

Synonyms

• Bitter orange
• Seville orange (a specific type)
• Bigarade orange

Notes on Different Meanings

The term "sour orange" has two closely related primary meanings: the fruit itself and the tree that bears it. The context usually makes it clear which is intended. It is distinct from a sweet orange that has simply turned sour in taste.

Noun

1. highly acidic orange used especially in marmalade
2. any of various common orange trees yielding sour or bitter fruit; used as grafting stock