1. 
   Mactra
   Mac'tra noun [ New Latin , from Greek ... kneading trough, from ... to knead.] (Zoology) 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
   Found op http://www.encyclo.co.uk/webster/M/3
   
   
2. 
   mactra
   <zoology> 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. ... Origin: NL, fr. Gr. Kneading trough, fr. To knead. ... Source: Websters Dictionary ... (01 Mar 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?mactra
   
   
3. 
   Mactra
   • (n.) 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.
   Found op http://thinkexist.com/dictionary/meaning/mactra/
   
   
4. 
   Mactra
   Mactra is a genus of medium-sized marine bivalve mollusks or clams, commonly known as trough shells or duck clams. Mactra is the type genus within the family Mactridae. The word "trough" in the common name refers to the fact that all Mactra shells have a large ligamental pit at the hinge line, whic...
   Found op http://en.wikipedia.org/wiki/Mactra
   
   
5. 
   Mactra
   Mactra is a genus of bivalve molluscs, including a number of British species. All the species live in sand, and are capable of using the foot in leaping. The shell is roughly triangular, the two valves being equal.
   Found op http://www.probertencyclopaedia.com/browse/BM.HTM
   
   

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