Cowry

Cowry or cowrie, plural cowries, is the common name for a group of small to large sea snails, marine gastropod molluscs in the family Cypraeidae, the cowries. The word cowry is also often used to refer only to the shells of these snails, which overall are often shaped more or less like an egg, except that they are rather flat on the underside. Man...
Found on http://en.wikipedia.org/wiki/Cowry

Cowry

• (n.) A marine shell of the genus Cypraea.
Found on http://thinkexist.com/dictionary/meaning/cowry/
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