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a small parasitic insect that lives and feeds on the body of warm-blooded animals
What is a "louse"?
A louse is a parasitic insect that typically infests the hair or feathers of animals, including humans, and feeds on their blood. These small insects have flattened bodies and specialized mouthparts for piercing the skin and sucking blood. They reproduce rapidly and can spread easily through close contact or shared belongings. Lice infestations, known as pediculosis, can be treated with various methods including insecticidal shampoos and meticulous removal of the insects and their eggs (nits) from the affected area.
a contemptible, unpleasant, or despicable person
American
What is the origin of the term "louse" and how is it used?
"Louse" is an English insult that dates back to at least the 16th century, originally referring to the parasitic insect that feeds on human or animal blood. By analogy, it came to describe a person who is contemptible, unpleasant, or despicable—someone seen as morally low, parasitic, or objectionable. The term is used in informal speech and writing across English-speaking countries, often in anger or ridicule. It is clearly derogatory but not vulgar, targeting a person's character rather than being profane.
any of several small insects especially aphids that feed by sucking the juices from plants
wingless insect with mouth parts adapted for biting; mostly parasitic on birds
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