(invertebrate zoology) The name applied to nematodes.
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Any of the parasitic, unsegmented, cylindrical in cross-section, elongated in shape, nematode worms which invade principally the gastrointestinal tract. Almost any organ can be involved. Comprises the class Nematoda and its large number of genera.
Any worm of the class Nematoda, including Ancylostoma duodenale, Ascaris lumbricoides, Enterobius vermicularis, and Strongy-loides stercoralis, that may infect the gastrointestinal tract of humans.