emerald:1

noun
em*er*ald \ ˈe-mə-rəld \ ˈem-rəld \
14th century{ds||1||}
  • a rich green variety of beryl prized as a gemstone
  • any of various green gemstones (such as synthetic corundum or demantoid)

emerald:2

adjective
emerald \
1508
  • brightly or richly green

emerald green

noun
emerald green \
1646{ds||1||}
  • a clear bright green resembling that of the emerald
  • any of various strong greens

emerald ash borer

noun
emerald ash borer \
2002
  • a metallic-green Asian beetle (Agrilus planipennis) accidentally introduced into the U.S. and having a destructive larva that bores into the wood of ash trees

emerald cut

noun
emerald cut \
1926
  • a rectangular cut for a gem having a series of parallel facets on each side and at each corner
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