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-).
"birth, origin," late 15c. (Caxton), from French naissance "birth, parentage, place of origin" (12c.), present participle of naître, from Gallo-Roman *nascere, from Latin nasci "be born" (see genus).
scientific name of the fruit fly, 1829, the genus name, from Modern Latin (Fallén, 1823), from Greek drosos "dew" (which Beekes says is "probably of Pre-Greek origin") + philos "loving" (see -phile).
"newly born or about to be born; rising or coming forth," originally a term in heraldry, 1570s, from French naissant, present participle of naître, from Gallo-Roman *nascere, from Latin nasci "be born" (see genus).