1 louse | Definition of louse

louse

noun
\ ˈlau̇s How to pronounce louse (audio) \

Definition of louse

 (Entry 1 of 2)

1 plural lice\ ˈlÄ«s How to pronounce lice (audio) \

a : any of various small wingless usually flattened insects (orders Anoplura and Mallophaga) parasitic (see parasite sense 2) on warm-blooded animals
b : a small usually sluggish arthropod (such as a biting louse) that lives on other animals or on plants and sucks their blood or juices
c : any of several small arthropods (such as a book louse) that are not parasitic
2 plural louses\ ˈlau̇-​sÉ™z How to pronounce louses (audio)\ : a contemptible person : heel what a beast, what a cad, what a louse he had been— Walter Karig

louse

verb
\ ˈlau̇s How to pronounce louse (audio) , ˈlau̇z How to pronounce louse (audio) \
loused; lousing

Definition of louse (Entry 2 of 2)

transitive verb

: to remove lice from

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Synonyms for louse

Synonyms: Noun

bastard, beast, bleeder [British], blighter [chiefly British], boor, bounder, bugger, buzzard, cad, chuff, churl, clown, creep, cretin, crud [slang], crumb [slang], cur, dirtbag [slang], dog, fink, heel, hound, jerk, joker, lout, pill, rat, rat fink, reptile, rotter, schmuck [slang], scum, scumbag [slang], scuzzball [slang], skunk, sleaze, sleazebag [slang], sleazeball [slang], slime, slimeball [slang], slob, snake, so-and-so, sod [chiefly British], stinkard, stinker, swine, toad, varmint, vermin

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Examples of louse in a Sentence

Noun

a problem with head lice Her ex-husband is a real louse.

Recent Examples on the Web: Noun

Consider the speckled sea louse (Eurydice pulchra). — Douglas Main, National Geographic, "Why oysters close on the full moon—and more odd lunar effects on animals," 17 Apr. 2019 Thanks to evolution, the pesky parasites known as lice have become resistant to most over-the-counter treatments. — Good Housekeeping, "Yikes! Super-Strains of Lice Have Spread to 25 States," 26 Feb. 2016

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'louse.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of louse

Noun

before the 12th century, in the meaning defined at sense 1a

Verb

14th century, in the meaning defined above

History and Etymology for louse

Noun and Verb

Middle English lous, from Old English lūs; akin to Old High German lūs louse, Welsh llau lice

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More Definitions for louse

louse

noun

English Language Learners Definition of louse

: a type of small insect that lives on the bodies of people or animals
informal : a bad or cruel person
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