a large edible clam, Saxidomus nuttalli, of the west coast of North America.
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- butter bean,
- butter brickle,
- butter cookie,
- butter knife,
- butter muslin,
- butter sauce,
- butter someone up
Origin of butter clam
First recorded in 1935–40
Also called Washington clam, money shell.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019