1
- a bright green precious stone consisting of a chromium-rich variety of beryl祖母绿, 绿宝石：
as modifier an emerald necklace.一条祖母绿项链。
2
- mass noun a bright green colour like that of an emerald艳绿色, 翠绿色：
as modifier the leaves are emerald green.树叶呈翠绿色。
3
- （亦作 emerald moth）a slender-bodied green moth, the colour of which tends to fade as the moth ages尺娥。
3.1
- Several genera in the family Geometridae.尺娥科的几个属。
4
- a hawker dragonfly with a metallic green body蜻蛉, 豆娘。
4.1
- Cordulia and other genera, family Corduliidae.伪蜓属及其他属, 伪蜓科。
5
- a small hummingbird with bright metallic green plumage and darker wings and tail, found mainly in the area of the Caribbean and Central America.一种小型蜂鸟（羽亮绿色, 翼尾色深, 主要产于加勒比地区和中美洲）。
5.1
- Three genera, in particular Chlorostilbon and Amazilia, family Trochilidae: numerous species.蜂鸟科, 3属, 尤指翠蜂鸟属和艳蜂鸟属, 众多种。
- bright green in colour翠绿色的, 鲜绿色的：
beyond the airport lay emerald hills.
机场的那边是苍翠的山峦。
词源
Middle English: from Old French e（s）meraud, ultimately via Latin from Greek （s）maragdos, via Prakrit from Semitic （compare with Hebrew bāreqeṯ, from bāraq 'flash, sparkle'）.