Word Study
    mactra
CIDE DICTIONARY
mactra, n. [NL., fr. Gr.  kneading trough, fr.  to knead.]. 
                                            
                                         Any marine bivalve shell of the genus Mactra , and allied genera. Many species are known. Some of them are used as food, as Mactra stultorum , of Europe. See Surf clam , under Surf.                                                                                 [1913 Webster]                                                                                                                    
                                                                                    
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