The roundworms, a large phylum that includes many of the helminths parasitic in humans and a far greater number of plant-parasitic and free-living soil and aquatic nonparasitic species. For practical purposes, the parasitic nematodes may be placed in two groups, based on their adult habitat in the human body : 1) the intestinal roundworms ( e.g., the genera Ascaris, Trichuris, Ancylostoma, Necator, Strongyloides, Enterobius, and Trichinella); and 2) the filarial roundworms of the blood, lymphatic tissues, and viscera ( e.g., the genera Wuchereria, Mansonella, Loa, Onchocerca, and Dracunculus). [nemat- + G. eidos, form]

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Nem·a·to·da .nem-ə-'tō-də n pl a phylum related to the Aschelminthes and comprising elongated cylindrical worms without an epithelial coelomic lining, with dorsal and ventral nerve cords, and with lateral excretory ducts that are parasites of humans, animals, or plants or free-living dwellers in soil or water and are known as roundworms, eelworms, or nematodes

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Nem·a·to·da (nem″ə-toґdə) [Gr. nēma thread + eidos form] the roundworms, a class of the phylum Aschelminthes, tapered cylindrical helminths, of which many species are parasites. They are characterized by longitudinally oriented muscles and by a triradiate esophagus. In some systems of classification, they are considered to be a separate phylum. Sometimes called Nemathelminthes, or a class under that phylum.

Medical dictionary. 2011.

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  • Nematoda — Nem a*to da, prop. n. pl. (Zo[ o]l.) A phylum of worms, having a long, round, and generally smooth body; the roundworms. They are mostly parasites, in plants and animals, but some are free living in soil or water. Also called {Nematoidea}. [1913… …   The Collaborative International Dictionary of English

  • Nematoda — Nematoda,   die Fadenwürmer …   Universal-Lexikon

  • Nematoda — Nematoda, Fadenwürmer, ca. 15000 beschriebene, schätzungsweise 100000 Arten umfassende Klasse der ⇒ Nemathelminthes; leben in Meer, Süßwasser und feuchter Erde; spielen als Parasiten eine bedeutende Rolle.     Die N. zeigen trotz großer Vielfalt… …   Deutsch wörterbuch der biologie

  • Nematoda — a class of worms, Modern Latin compound of nemat thread (from Gk. nema, gen. nematos thread, from stem of nein to spin; see NEEDLE (Cf. needle) (n.)) + odes like, of the nature of (see OID (Cf. oid)) …   Etymology dictionary

  • Nematoda — Nématodes …   Wikipédia en Français

  • Nematoda —   Nematodos …   Wikipedia Español

  • Nematoda — Fadenwürmer Heterodera glycines mit einem Ei, ein Parasit der Sojabohne Systematik Unterreich …   Deutsch Wikipedia

  • Nematoda — Nematoidea Nem a*toi de*a, prop. n. pl. [NL., fr. Gr. nh^ma, nh matos, thread + oid.] (Zo[ o]l.) A phylum of worms, having a long, round, and generally smooth body; the roundworms. Called also {Nematodea}, and more commonly {Nematoda}. Formerly,… …   The Collaborative International Dictionary of English

  • Nematoda — n. (Zoology) phylum of Nematoda (roundworms, parasites) …   English contemporary dictionary

  • Nematoda — noun unsegmented worms: roundworms; threadworms; eelworms • Syn: ↑phylum Nematoda, ↑Aschelminthes, ↑phylum Aschelminthes • Hypernyms: ↑phylum • Member Holonyms: ↑Animalia, ↑ …   Useful english dictionary

  • Nematoda (classification phylogenetique) — Nematoda (classification phylogénétique) Cette page a pour objet de présenter un arbre phylogénétique des Nematoda (ou Nématodes), c est à dire un cladogramme mettant en lumière les relations évolutives complexes (relations groupes ancestraux… …   Wikipédia en Français

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