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.

Dutch: zure sinaasappel, bittersinaasappel, pomerans
Polish: pomarańcza kwaśna, pomarańcza gorzka

Highly acidic orange used especially in marmalade.

synonyms: bitter orange, sour orange.

Dutch: pomerans