/ ˈemərəld; NAmE / noun
1.
[ C , U ] a bright green precious stone :
an emerald ring
2.
(also ˌemerald ˈgreen ) [ U ] a bright green colour
► em·er·ald (also ˌemerald ˈgreen ) adjective
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WORD ORIGIN
Middle English : from Old French e(s)meraud , ultimately via Latin from Greek (s)maragdos , via Prakrit (an ancient Indian language) from Semitic (compare with Hebrew bāreqeṯ , from bāraq flash, sparkle).