Zoology. Any worm of the phylum Nematoda; a nematode.

A nematode worm.

= nematode, n. Now rare.

Any of various parasitic nematodes or trematodes which circulate in the blood of humans and other animals.

Veterinary Medicine. A minute parasitic nematode worm of the genus Dirofilaria, esp. D. immitis, which typically infests the pulmonary blood…

(In form Rhabdonema) a former genus of parasitic nematode worms (now included in the genus Ascaris) which pass through a rhabditiform stage in the…

any of several large strongyles (threadworms) that infest horses, esp. Strongylus vulgaris, S. edentatus, and S. equinus, so called from having a…

either of two parasitic nematodes, Stephanurus dentatus, which attacks pigs, or Dioctophyma (or Dioctophyme) renale, which attacks man, dogs, and…

the parasitic nematode worm (see tunnel-disease n.) which causes tunnel-anæmia.

A nematode, esp. one that parasitizes plants.

A rhabditoid nematode.