El DoradoPronunciation: /ˌɛl dəˈrɑːdəʊ/Definition of El Dorado the name of a fictitious country or city abounding in gold, formerly believed to exist somewhere in the region of the Orinoco and Amazon Rivers. [as noun] (also eldorado) (plural El Dorados or eldorados) a place of great abundance. Origin:Spanish, literally 'the gilded one'El Dorado in other Oxford dictionaries Definition of El Dorado in the US English dictionary