cornucopia
1. Greek myth the horn of Amalthea, the goat that suckled Zeus
2. a representation of such a horn in painting, sculpture, etc., overflowing with fruit, vegetables, etc.; horn of plenty
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
cornucopia
A goat’s horn overflowing with fruits, flowers and corn, signifying prosperity; a horn of plenty; any cone-shaped receptacle or ornament.

See also: OrnamentIllustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
cornucopia
conical receptacle which symbolizes abundance. [Rom. Myth.: Kravitz, 65]
cornucopia
conical receptacle full of the fruits of the harvest. [World Culture: Misc.]
Allusions—Cultural, Literary, Biblical, and Historical: A Thematic Dictionary. Copyright 2008 The Gale Group, Inc. All rights reserved.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
Cornucopia
(also horn of plenty), in Greek mythology, the horn of the goat Amalthea, Zeus’ wet nurse. According to the myth, the horn possessed the magical ability to provide its owners with unlimited food and drink. In the figurative sense, a cornucopia is a symbol of abundance and wealth.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.