Hebrews nophek (Exodus 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 (Revelation 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."

Noah Webster's New International Dictionary of the English Language

1. (n.) A precious stone of a rich green color, a variety of beryl. See Beryl.

2. (n.) A kind of type, in size between minion and nonpareil. It is used by English printers.

3. (a.) of a rich green color, like that of the emerald.