em·er·ald 
(
ĕm
ər-
əld,
ĕm
r
əld)
n.1. A brilliant green to grass-green transparent variety of beryl, used as a gemstone.
2. A strong yellowish green.
adj. Of a strong yellowish green.
[Middle English emeraude, from Old French, from Medieval Latin esmeralda, esmeraldus, from Latin smaragdus, from Greek smaragdos; akin to Sanskrit marakatam, probably of Semitic origin; akin to Akkadian barraqtu and Hebrew bāreqet, a kind of gemstone (probably emerald); see brq in the Appendix of Semitic roots.]