Source : Webster's Revised Unabridged Dictionary (1913)

El Dorado \El` Do*ra"do\, pl. {El Doradoes}. [Sp., lit., the
   gilt (sc. land); el the + dorado gilt, p. p. of dorare to
   gild. Cf. {Dorado}.]
   1. A name given by the Spaniards in the 16th century to an
      imaginary country in the interior of South America,
      reputed to abound in gold and precious stones.

   2. Any region of fabulous wealth; exceeding richness.

            The whole comedy is a sort of El Dorado of wit. --T.
                                                  Moore.