1. 
   asiphonida
   <marine biology> A group of bivalve mollusks destitute of siphons, as the oyster; the asiphonate mollusks. ... Origin: NL, fr. Gr. Priv. + a tube. ... (19 Mar 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?asiphonida
   
   
2. 
   Asiphonida
   • (n. pl.) A group of bivalve mollusks destitute of siphons, as the oyster; the asiphonate mollusks.
   Found op http://thinkexist.com/dictionary/meaning/asiphonida/
   
   

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