Emerald adj. 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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