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Cestoidea :: Cestoidea (n. pl.) A class of parasitic worms (Platelminthes) of which the tapeworms are the most common examples. The body is flattened, and usually but not always long, and composed of numerous joints or segments, each of which may contain a complete set of male and female reproductive organs. They have neither mouth nor intestine. See Tapeworm..

Smut :: Smut (v. t.) An affection of cereal grains producing a swelling which is at length resolved into a powdery sooty mass. It is caused by parasitic fungi of the genus Ustilago. Ustilago segetum, or U. Carbo, is the commonest kind; that of Indian corn is Ustilago maydis..

Squawweed :: Squawroot (n.) A scaly parasitic plant (Conopholis Americana) found in oak woods in the United States; -- called also cancer root.

Trematodea :: Trematodea (n. pl.) An extensive order of parasitic worms. They are found in the internal cavities of animals belonging to all classes. Many species are found, also, on the gills and skin of fishes. A few species are parasitic on man, and some, of which the fluke is the most important, are injurious parasites of domestic animals. The trematodes usually have a flattened body covered with a chitinous skin, and are furnished with two or more suckers for adhesion. Most of the species are hermaphrodi

Acarina :: Acarina (n. pl.) The group of Arachnida which includes the mites and ticks. Many species are parasitic, and cause diseases like the itch and mange..

Louse :: Louse (n.) Any one of numerous species of small, wingless, suctorial, parasitic insects belonging to a tribe (Pediculina), now usually regarded as degraded Hemiptera. To this group belong of the lice of man and other mammals; as, the head louse of man (Pediculus capitis), the body louse (P. vestimenti), and the crab louse (Phthirius pubis), and many others. See Crab louse, Dog louse, Cattle louse, etc., under Crab, Dog, etc..

Broom Rape :: Broom rape () A genus (Orobanche) of parasitic plants of Europe and Asia. They are destitute of chlorophyll, have scales instead of leaves, and spiked flowers, and grow attached to the roots of other plants, as furze, clover, flax, wild carrot, etc. The name is sometimes applied to other plants related to this genus, as Aphyllon uniflorumand A. Ludovicianum..

Myzostomata :: Myzostomata (n. pl.) An order of curious parasitic worms found on crinoids. The body is short and disklike, with four pairs of suckers and five pairs of hook-bearing parapodia on the under side..

Rust :: Rust (v. i.) To be affected with the parasitic fungus called rust; also, to acquire a rusty appearance, as plants..

Arrhizous :: Arrhizous (a.) Destitute of a true root, as a parasitical plant..

Entomophaga :: Entomophaga (n. pl.) One of a group of hymenopterous insects whose larvae feed parasitically upon living insects. See Ichneumon, 2..

Branchiura :: Branchiura (n. pl.) A group of Entomostraca, with suctorial mouths, including species parasitic on fishes, as the carp lice (Argulus)..

Strongyloid :: Strongyloid (a.) Like, or pertaining to, Strongylus, a genus of parasitic nematode worms of which many species infest domestic animals. Some of the species, especially those living in the kidneys, lungs, and bronchial tubes, are often very injurious..

Malacobdella :: Malacobdella (n.) A genus of nemertean worms, parasitic in the gill cavity of clams and other bivalves. They have a large posterior sucker, like that of a leech. See Illust. of Bdellomorpha..

Ascarid :: Ascarid (n.) 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..

Triungulus :: Triungulus (n.) The active young larva of any oil beetle. It has feet armed with three claws, and is parasitic on bees. See Illust. of Oil beetle, under Oil..

Sporocyst :: Sporocyst (n.) An asexual zooid, usually forming one of a series of larval forms in the agamic reproduction of various trematodes and other parasitic worms. The sporocyst generally develops from an egg, but in its turn produces other larvae by internal budding, or by the subdivision of a part or all of its contents into a number of minute germs. See Redia..

Rot :: Rot (n.) A fatal distemper which attacks sheep and sometimes other animals. It is due to the presence of a parasitic worm in the liver or gall bladder. See 1st Fluke, 2..

Lernaea :: Lernaea (n.) A Linnaean genus of parasitic Entomostraca, -- the same as the family Lernaeidae..

Gapeworm :: Gapeworm (n.) The parasitic worm that causes the gapes in birds. See Illustration in Appendix.

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