1.NounA goat's horn endlessly overflowing with fruit, flowers and grain; or full of whatever its owner wanted: or, an image of a such a horn, either in two or three dimensions.
2.NounA hollow horn- or cone-shaped object, filled with edible or useful things.
3.NounAn abundance or plentiful supply.
"The store provided a veritable cornucopia of modern gadgets."