Definition of louse
1
plural lice
play
\ˈlīs\
a
: any of various small wingless usually flattened insects (orders Anoplura and Mallophaga) parasitic (see parasite 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
