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of or pertaining to the Nematoidea. -- n.

An order of worms, having a long, round, and generally smooth body; the roundworms. they are mostly parasites. Called also Nematodea, and Nematoda.

Nematoid.

A parasitic nematoid worm, espec. the roundworm, Ascaris lumbricoides, often occurring in the human intestine and allied species found in domestic animals; also commonly applied to the pinworm (Oxyuris), often troublesome to children and aged persons.

Containing a body cavity; as, the cavitary or nematoid worms.

A division of nematoid worms, including the hairworms or hair eels (Gordius and Mermis). See Gordius, and Illustration in Appendix.

A genus of long, slender, nematoid worms, parasitic in insects until near maturity, when they leave the insect, and live in water, in which they deposit their eggs; -- called also hair eel, hairworm, and hair snake, from the absurd, but common and widely diffused, notion that they are metamorphosed horsehairs.…

A nematoid worm of the genus Gordius, resembling a hair. See Gordius.

Any one of several species of parasitic nematoid worms which infest the lungs and air passages of cattle, sheep, and other animals, often proving fatal. The lungworm of cattle (Strongylus micrurus) and that of sheep (S. filaria) are the best known.

An order of helminths, including the Nematoidea and Gordiacea; the roundworms. [Written also Nematelminthea.]

Same as Nematoid.

n beneath the epidermis of the upper surface of many leaves. -- Palisade worm (Zoöl.), a nematoid worm (Strongylus armatus), parasitic in the blood vessels of the horse, in which it produces aneurisms, often fatal.

A small nematoid worm (Oxyurus vermicularis), which is parasitic chiefly in the rectum of man. It is most common in children and aged persons.

A nematoid worm.

iler plate, and thicker than sheet iron or stovepipe iron. -- Tank worm (Zoöl.), a small nematoid worm found in the water tanks of India, supposed by some to be the young of the Guinea worm.

A small, slender nematoid worm (Trichina spiralis) which, in the larval state, is parasitic, often in immense numbers, in the voluntary muscles of man, the hog, and many other animals. When insufficiently cooked meat containing the larvæ is swallowed by man, they are liberated and rapidly become adult, pair, and the ov…