noun. any of various common orange trees yielding sour or bitter fruit; used as grafting stock.
noun. ['ˈsɪtrəs'] any of numerous fruits of the genus Citrus having thick rind and juicy pulp; grown in warm regions.
noun. ['ˈsɪtrəs'] 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.