from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A small, dry, usually round soda cracker.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A
small, dry, usually roundcracker.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a small dry usually round cracker
from Wiktionary, Creative Commons Attribution/Share-Alike License
Perhaps because originally served with oyster stew or clam chowder, or because their form (a vaguely round "shell" that splits evenly into two parts) was suggestive of the shell of an oyster.
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