any small tree or spiny shrub of the genus Citrus, of the rue family, including the lemon, lime, orange, tangerine, grapefruit, citron, kumquat, and shaddock, widely cultivated for fruit or grown as an ornamental.
the tart-to-sweet, pulpy fruit of any of these trees or shrubs, having a characteristically smooth, shiny, stippled skin.
Also, citrous. of or pertaining to such trees or shrubs, or their fruit.
1825, from Mod.L. genus name, from L. citron, name of a tree with lemon-like fruit, the first citrus fruit available in the West. The name, like the tree, is probably of Asiatic origin. But Klein traces it to Gk. kedros "cedar," and writes that the change of dr into tr shows that the word came from Greek into Latin through the medium of the Etruscans. Citric first recorded 1800.
Any of various evergreen trees or shrubs bearing fruit with juicy flesh and a thick rind. Citrus trees are native to southern and southeast Asia but are grown in warm climates around the world. Many species have spines. The orange, lemon, lime, and grapefruit are citrus trees.
The usually edible fruit of one of these trees or shrubs.