- an orange tree (Citrus aurantium) widely grown as a rootstock for grafting other citrus trees
- its fruit, used in making marmalade
See sour orange in American Heritage Dictionary 4
In both senses also called bigarade
, bitter orange
, Seville orange
- A spiny evergreen tree (Citrus aurantium) native to southern Vietnam and widely cultivated in warmer regions, having globose, reddish-orange, highly acidic fruit.
- The fruit of this tree.