- any small tree or spiny shrub of the genusCitrus, 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.
- of or relating to such trees or shrubs, or their fruit.
- any tree or shrub of the tropical and subtropical rutaceous genus Citrus, which includes the orange, lemon, lime, grapefruit, citron, and calamondin
- of, relating to, or belonging to the genus Citrus or to the fruits of plants of this genus
