Spirurida
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Spi·ru·ri·da | \ spī-ˈru̇r-ə-də 
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\Medical Definition of Spirurida
: 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
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