Mac·tri·dae | \ -rəˌdē\
Definition of Mactridae
: a widely distributed family of marine clams (suborder Tellinacea) that have closely fitting or slightly gapping shells with two cardinal teeth in each valve and fused ensheathed siphons of equal length and that comprise the surf clams — compare lutraria , mactra, spisula
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incapable of being surmounted or overcome
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