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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
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
plural ; citrusesor ; citrus: any plant or fruit of the genus Citrus or a related genus
Any of the plants that make up the genus Citrus, in the rue family, that yield pulpy fruits covered with fairly thick skins. The genus includes the lemon, lime, sweet and sour oranges, tangerine, grapefruit, citron, and shaddock (C. maxima, or C. grandis; also called pomelo).