Emerald Em"er*ald, a. Of a rich green color, like that of the emerald. ``Emerald meadows.'' --Byron. [1913 Webster]

{Emerald fish} (Zo["o]l.), 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}. [1913 Webster]

The Collaborative International Dictionary of English. 2000.