louse

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louse,

common name for members of either of two distinct orders of wingless, parasitic, disease-carrying insectsinsect,
invertebrate animal of the class Insecta of the phylum Arthropoda. Like other arthropods, an insect has a hard outer covering, or exoskeleton, a segmented body, and jointed legs. Adult insects typically have wings and are the only flying invertebrates.
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. Lice of both groups are small and flattened with short legs adapted for clinging to the host.

The sucking lice, of the order Anoplura, are external parasites of humans and other mammals, feeding on blood by means of their piercing-and-sucking mouthparts. The group includes the body lice and head lice, considered varieties of the same species, Pediculus humanus, and the crab, or pubic, louse, Phthirus pubis, named for its crablike appearance. A female sucking louse lays about 300 eggs, or nits, in her lifetime, cementing them to body hairs and underclothing. The larva resembles the adult; the life cycle takes about 16 days. Sucking lice infestations are common in crowded living conditions and where clothing is not changed or washed frequently. Body lice may transmit rickettsial diseases (see rickettsiarickettsia
, any of an order (Rickettsiales) of very small microorganisms, many disease-causing, that live in vertebrates and are transmitted by bloodsucking parasitic arthropods such as fleas, lice (see louse), and ticks.
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) and bacterial infections such as relapsing feverrelapsing fever,
infectious disease caused by a spirochete bacteria of the genus Borrelia and characterized by a high fever that breaks and then recurs a one to two weeks later. Relapsing fever may be transmitted by body lice or soft ticks.
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; infection results from scratching the crushed louse or its feces into the skin.

The chewing, or biting, lice, of the order Mallophaga, have chewing mouthparts and feed on hair, skin, or feather fragments of the host. They attack birds, rodents, and domesticated animals. Although they do not actually puncture the skin, and thus are scavengers and not true parasites, they often multiply so rapidly that they irritate, weaken, and may even kill the host. The chicken louse, Menopon pallidum, if left uncontrolled, can be a major problem in poultry production. Chewing lice may produce 6 to 12 generations annually. The eggs hatch into rapidly developing young in which metamorphosismetamorphosis
[Gr.,=transformation], in zoology, term used to describe a form of development from egg to adult in which there is a series of distinct stages. Many insects, amphibians, mollusks, crustaceans, and fishes undergo metamorphosis, which may involve a change in habitat,
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 is incomplete, as in many parasites.

The book louse is a tiny, wingless, cosmopolitan insect that damages books by feeding on glue, paste, and paper. It resembles lice but is not related, belonging to the order Psocoptera. The aphidaphid
or plant louse,
tiny, usually green, soft-bodied, pear-shaped insect injurious to vegetation. It is also called greenfly and blight. Aphids are mostly under 1-4 in. (6 mm) long.
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 is sometimes called plant louse.

Lice are classified in the phylum ArthropodaArthropoda
[Gr.,=jointed feet], largest and most diverse animal phylum. The arthropods include crustaceans, insects, centipedes, millipedes, spiders, scorpions, and the extinct trilobites.
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, class Insecta, orders Anoplura and Mallophaga.

Bibliography

See bulletins of the U.S. Dept. of Agriculture.

louse

[lau̇s]
(invertebrate zoology)
The common name for the apterous ectoparasites composing the orders Anoplura and Mallophaga.

louse

1. any wingless bloodsucking insect of the order Anoplura: includes Pediculus capitis (head louse), Pediculus corporis (body louse), and the crab louse, all of which infest man
2. biting or bird louse any wingless insect of the order Mallophaga, such as the chicken louse: external parasites of birds and mammals with biting mouthparts
3. any of various similar but unrelated insects, such as the plant louse and book louse
References in periodicals archive ?
Thus the comb data indicated these prehistoric Arica populations created functional objects for delousing and grooming.
The court ruled that whether the jail's delousing policy, which allegedly applied to all pretrial detainees, was reasonable under the Fourth Amendment could not be decided on a motion to dismiss.
There were other small animals and several birds that Eclipse nursed back to health, her small, knowing hands zeroing in on broken bones and wings, filling their beaks with eyedroppers of sweet water, bathing ulcerated sores, delousing with the devotion of a monkey.
Dutch genre painting constitutes a monument to wrinkled child care--not least the heavily symbolic delousing of the small girl by old women who can also be caught at their spinning wheel or feeding hens and who have a place at the meal table.
The men were registered at the camp's administration building and then taken to the delousing station.
The blueprints give chilling details, with gas chambers, crematoria, delousing facilities and watchtowers drawn to scale.
At every turn, according to Sloterdijk, product design was there to assist in new forms of environmental terror: For example, without the breakthrough of Zyklon B, a solid form of hydrogen cyanide that allows for its transportation before its conversion to gas, the technology of delousing might not have found its way quite so readily into the Nazi camps.
Reality also emerges by means of archival material: Luis Cernuda, the British documentary about Owen's utopian experience, engineers on the way to work, although they are not going to the Humanisphere, as the voice-over says, or the delousing campaigns during the war.
Friends in the goat world and Drummond's book helped us through the processes of worming, tetanus shot administration, hoof trimming and delousing.
Look for a crusty circle on the face or neck of your goats when you are doing your spring delousing.
Sometimes visitors were required to undergo delousing.
The event would seemingly refer to the armpit shaving during delousing, which would normally involve the removal of infested clothing, after which Boris still "itched" and Miller "scratched;' leading them to become "intimate:'