trichocephalus dispar

from The Collaborative International Dictionary of English v.0.48
Whipworm \Whip"worm`\, n. [So called from its shape.] (Zool.)
   A nematode worm ({Trichocephalus dispar}) often found
   parasitic in the human intestine. Its body is thickened
   posteriorly, but is very long and threadlike anteriorly.
   [1913 Webster]
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