what is citrus
Full Definition of CITRUS. : any of a group of often thorny trees and shrubs (Citrus and related genera) of the rue family grown in warm regions for their edible fruit (as the orange or lemon) with firm usually thick rind and pulpy flesh; also: the fruit.â citÂ·rusy \Ësi-trÉ-sÄ\ adjective.. capitalized: a genus of often thorny trees and shrubs of the rue family (Rutaceae) grown in warm regions for their edible fruit (as the orange, lemon, lime, or mandarin) with firm usually thick rind and pulpy flesh. 2. plural citruses or citrus: any plant or fruit of the genus Citrus or a related genus.