n pl :  an order of parasitic nematodes of the subclass Aphasmidia that are characterized by an esophagus divided into two cylinder-shaped regions and having six lips and no buccal stylet and that include various parasites (as the filarial worms) of vertebrates having complex life cycles requiring an invertebrate intermediate host .
 
 
 
Similar sounding terms:  Spi·rur·i·dae  spi·rur·oid 
 
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