roundworm, another name for a nematode. See phylum Nematoda Nematoda , phylum consisting of about 12,000 known species, and many more predicted species of worms (commonly known as roundworms or threadworms). Nematodes live in the soil and other terrestrial habitats as well as in freshwater and marine environments.
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Any of more than 15,000 named and many more unnamed species of worms in the class Nematoda (phylum Aschelminthes). Nematodes include plant and animal parasites and free-living forms found in soil, freshwater, saltwater, and even vinegar and beer malts. They are bilaterally symmetrical and usually tapered at both ends. Some species have separate sexes; others are hermaphroditic. They range from microscopic to about 23 ft (7 m) long. Nematode parasites can occur in almost any body organ but are most common in the digestive, circulatory, or respiratory system. Hookworms, pinworms, and eelworms are nematodes. See also filarial worm, guinea worm, trichina.
roundworm
roundworm [′rau̇nd‚wərm]
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nematode
or roundworm)
Nematode (Ascaris lumbricoides)
(credit: Javier Palaus Soler—Ostman Agency)
roundworm
any nematode worm, esp Ascaris lumbricoides, a common intestinal parasite of man and pigs
roundworm [′rau̇nd‚wərm]
(invertebrate zoology)
The name applied to nematodes.
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