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citrus (adj.)

any tree of the genus Citrus, or its fruit, 1825, from the Modern Latin genus name, from Latin citrus "citron tree," the name of an African tree with aromatic wood and lemon-like fruit, the first citrus fruit to become available in the West. The name, like the tree, is probably of Asiatic origin [OED] or from a lost non-IE Mediterranean language [de Vaan]. But Klein and others trace it to Greek kedros "cedar," perhaps via Etruscan (a suggested by the change of -dr- to -tr-).

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Definitions of citrus from WordNet

citrus (n.)
any of numerous fruits of the genus Citrus having thick rind and juicy pulp; grown in warm regions;
Synonyms: citrus fruit / citrous fruit
citrus (n.)
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;
Synonyms: citrus tree
From wordnet.princeton.edu