Em·er·ald, a. Of a rich green color, like that of the emerald. “Emerald meadows.”
 Emerald fish Zoöl., a fish of the Gulf of Mexico (Gobionellus oceanicus), remarkable for the brilliant green and blue color of the base of the tongue; -- whence the name; -- called also esmeralda.
 Emerald green, a very durable pigment, of a vivid light green color, made from the arseniate of copper; green bice; Scheele's green; -- also used adjectively; as, emerald green crystals.
 Emerald Isle, a name given to Ireland on account of the brightness of its verdure.
 Emerald spodumene, or Lithia emerald. Min. See Hiddenite.
 Emerald nickel. Min. See Zaratite.

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 Emerald Isle
      n : an island comprising the republic of Ireland and Northern
          Ireland [syn: Ireland, Hibernia]