■ noun
1》 a bright green precious stone consisting of a chromium-rich variety of beryl.
2》 (also ~ green ) a bright green colour.
3》 (also ~ moth ) a slender-bodied green moth. [ Geometra papilionaria ( large ~ ) and other species.]
Phrases
the Emerald Isle Ireland.
Origin
ME: from OFr. e(s)meraud , ult. via L. from Gk (s)maragdos , via Prakrit from Semitic (cf. Heb. bāreqeṯ , from bāraq 'flash, sparkle').