What is the meaning of Emerald?

Any of various green gemstones, especially a green transparent form of beryl, highly valued as a precious stone.

Emerald green, a colour.

Vert, when blazoning by precious stones.

Any hummingbird in the genera Chlorostilbon and Elvira; and some in the genus Amazilia

Any of various species of dragonfly of the family Corduliidae.

A size of type between nonpareil and minion, standardized as 6½-point.

Of a rich green colour.

To ornament with, or as if with, emeralds; to make green.

Source: wiktionary.org