the shell of any marine mollusk.
Also, sea shell.

before 900; Old English sǣscill (not recorded in Middle English) see sea, shell Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
seashell (ˈsiːˌʃɛl)
the empty shell of a marine mollusc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

O.E. sæscel (see sea and shell).
Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Britannica


hard exoskeleton of marine mollusks such as snails, bivalves, and chitons that serves to protect and support their bodies. It is composed largely of calcium carbonate, which is formed from substances secreted by the mantle, a skinlike tissue in the mollusk's body wall. Seashells are usually made up of several layers of distinct microstructures that have differing mechanical properties. The shell layers are secreted by different parts of the mantle, although actual incremental growth can take place only at the shell margin. One of the most distinctive microstructures is nacre, or mother-of-pearl, which occurs as an inner layer in the shells of some gastropods and bivalves and in those of the cephalopods Nautilus and Spirula.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The blue specks are likely naturally occurring seashell particles or minerals.
The aroma of burning sage and sounds of horns made from seashell and ram's horn funneled through the cove.
Each one of you is going to get a small seashell and a piece of aluminum foil.
Bird-shaped ornament of turquoise mosaic on seashell.
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