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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]