Sea″ clam′ (?). (Zoöl.) Any one of the large bivalve mollusks found on the open seacoast, especially those of the family Mactridæ, as the common American species. (Mactra, orSpisula, solidissima); — called also beach clam, and surf clam.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.