Word Study
    asiphonata
CIDE DICTIONARY
asiphonata, n. pl. [NL., fr. Gr. 'a priv. +  a tube.]. 
                                            
                                         A group of bivalve mollusks destitute of siphons, as the oyster; the asiphonate mollusks.                                                                                 [1913 Webster]                                                                                                                    
                                                                                    
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