emerald meanings
Definition of emerald for English Language Learners. : 1  a bright green stone that is used in jewelry. : 2  a bright or rich green color.
emerald - a green transparent form of beryl; highly valued as a gemstone. 1  beryl - the chief source of beryllium; colored transparent varieties are valued as gems. 2  transparent gem - a gemstone having the property of transmitting light without serious diffusion.