Mecistocirrus
noun
Me·cis·to·cir·rus
| \ mə-ˌsis-tō-ˈsir-əs
\
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Medical Definition of Mecistocirrus
: a genus of nematode worms of the family Trichostrongylidae including a common parasite (M. digitatus) of the abomasum of domesticated ruminants and the stomach of swine in both of which it may cause serious loss of blood and digestive disturbances especially in young animals