louse
(n. laʊs; v. also laʊz)
n., pl. lice (līs) for 1–3, lous•es for 4, n. 1. any of various small, flat, wingless insects of the order Anoplura, with sucking mouthparts, that are parasitic on humans and other mammals, as
Pediculus humanuscapitis (
head louse) and
P. humanus corporis (
body louse).
2. any similar insect of the order Mallophaga, with biting mouthparts, parasitic on birds and some mammals.
4. Slang. a contemptible person.
v.t. 5. to delouse.
6. louse up, Slang. to spoil; botch.
[before 900; Middle English lous(e),luse, Old English lūs, c. Middle Dutch, Middle Low German, Old High German, Old Norse lūs]
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