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n. pl.1.(Zool.) A division of nematoid worms, including the hairworms or hair eels (Gordius and Mermis). See Gordius, and Illustration in Appendix.
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The description of the North American Gordiacea, with description of a new species.
Horse-hair worms (Gordiacea) develop as parasites in the bodies of grasshoppers and crickets.