head louse

noun

: a sucking louse (Pediculus humanus capitis) that lives on the human scalp

Examples of head louse in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Unlike the body louse, the head louse isn’t known to spread disease. oregonlive, 28 Nov. 2021 Scientifically known as pediculosis capitis, head lice aren't contracted as a result of slacking on your personal hygiene practices. Rebecca Dancer, Allure, 8 Nov. 2019 The medication for head lice, called pediculicide, should be applied according to the instructions, per the CDC. Sarah Bradley, Health.com, 24 Oct. 2019 Since clothing lice evolved from head louse ancestors once humans adopted clothing, dating the emergence of clothing lice may provide more specific estimates of the origin of clothing use. Razib Khan, Discover Magazine, 9 Sep. 2010

Word History

First Known Use

1547, in the meaning defined above

Time Traveler
The first known use of head louse was in 1547

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Cite this Entry

“Head louse.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/head%20louse. Accessed 6 Jul. 2026.

Kids Definition

head louse

noun
: a sucking louse that lives on the human scalp

Medical Definition

head louse

noun
: a sucking louse of the genus Pediculus (P. humanus capitis) that lives on the human scalp

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