'sour orange' definitions:

Definition of 'sour orange'

(from WordNet)

noun

Any of various common orange trees yielding sour or bitter fruit; used as grafting stock [syn: sour orange, Seville orange, bitter orange, bitter orange tree, bigarade, marmalade orange, Citrus aurantium]

noun

Highly acidic orange used especially in marmalade [syn: bitter orange, Seville orange, sour orange]

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