em·er·ald /ˈɛmrəld, ˈɛmə-/
  翡翠,綠寶石,翠綠色(a.)翡翠的,翠綠色的
  Em·er·ald n.
  1. Min. A precious stone of a rich green color, a variety of beryl. See Beryl.
  2. Print. A kind of type, in size between minion and nonpare░l. It is used by English printers.
  Note: ☞ This line is printed in the type called emerald.
  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
       n 1: a green transparent form of beryl; highly valued as a
            gemstone
       2: a transparent piece of emerald that has been cut and
          polished and is valued as a precious gem
       3: the green color of an emerald
  Emerald
     Heb. nophek (Ex. 28:18; 39:11); i.e., the "glowing stone",
     probably the carbuncle, a precious stone in the breastplate of
     the high priest. It is mentioned (Rev. 21:19) as one of the
     foundations of the New Jerusalem. The name given to this stone
     in the New Testament Greek is smaragdos, which means "live
     coal."