ETYM Latin, a citron tree.
(Irregular plural: citruses).
1. Any of numerous fruits of the genus Citrus having thick rind and juicy pulp; grown in warm regions; SYN. citrus fruit.
2. Any of numerous tropical usually thorny evergreen trees of the genus Citrus having leathery evergreen leaves and widely cultivated for their juicy edible fruits having leathery aromatic rinds; SYN. citrus tree.
Any tree or shrub of the genus Citrus, family Rutaceae. Citruses are found in Asia and other warm parts of the world. They are evergreen and aromatic, and several species— the orange, lemon, lime, citron, and grapefruit—are cultivated for fruit.