[em.er.ald] n [ME emerallde, fr. MF esmeralde, fr. (assumed) VL smaralda, fr. L smaragdus, fr. Gk smaragdos] (14c) 1: a rich green variety of beryl prized as a gemstone
2: any of various green gemstones (as synthetic corundum or demantoid)
[2]emerald adj (1508): brightly or richly green