[em-er-uhld, em-ruhld]
a rare variety of beryl that is colored green by chromium and valued as a gem.
Printing. (in Britain) a 6½-point type of a size between nonpareil and minion.
Ornithology. any of numerous small bright green hummingbirds of the genus Chlorostilbon.
having a clear, deep-green color.

1250–1300; Middle English emeraude, emeralde < Anglo-French, Old French esmeraude, esmeralde, esmeragde < Latin smaragdus < Greek smáragdos; probably ultimately < Semitic b-r-q shine (≫ Sanskrit marāk(a)la emerald)

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
emerald (ˈɛmərəld, ˈɛmrəld)
1.  a green transparent variety of beryl: highly valued as a gem
2.  a.  the clear green colour of an emerald
 b.  (as adjective): an emerald carpet
3.  (formerly) a size of printer's type approximately equal to 6½ point
4.  short for emerald moth
[C13: from Old French esmeraude, from Latin smaragdus, from Greek smaragdos; related to Sanskrit marakata emerald]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1300, from O.Fr. emeraude, from M.L. esmaraldus, from L. smaragdus, from Gk. smaragdos "green gem," from Sem. baraq "shine" (cf. Heb. bareqeth "emerald," Arabic barq "lightning"). Skt. maragdam "emerald" is from the same source, as is Pers. zumurrud, whence Turk. zümrüd, source of Rus. izumrud
"In early examples the word, like most other names of precious stones, is of vague meaning; the mediæval references to the stone are often based upon the descriptions given by classical writers of the smaragdus, the identity of which with our emerald is doubtful." [OED]
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
emerald   (ěm'ər-əld)  Pronunciation Key 
A transparent, green form of the mineral beryl. It is valued as a gem.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Computing Dictionary

Emerald definition

An object-oriented distributed programming language and environment developed at the University of Washington in the early 1980s. Emeral was the successor to EPL. It is strongly typed and uses signatures and prototypes rather than inheritance.
["Distribution and Abstract Types in Emerald", A. Black et al, IEEE Trans Soft Eng SE-13(1):65-76 (Jan 1987)].

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Bible Dictionary

Emerald definition

Heb. nophek (Ex. 28:18; 39:11); i.e., the "glowing stone", probably the carbuncle, a precious stone in the breastplate of the high priest. It is mentioned (Rev. 21:19) as one of the foundations of the New Jerusalem. The name given to this stone in the New Testament Greek is smaragdos, which means "live coal."

Easton's 1897 Bible Dictionary
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Example sentences
Knowing her husband's devotion to reptiles, she gave him an emerald-tree boa for his birthday.
But the emerald hillsides appear lovely even without the walk and outstanding
  picnic spots abound.
Thicker chunks glow emerald green, bejeweled by algae.
Here the river stalls out in emerald pools warm enough for a summer swim.
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