RhymeZone: louse definitions

Definitions of louse:

noun: wingless usually flattened blood-sucking insect parasitic on warm-blooded animals
noun: any of several small insects especially aphids that feed by sucking the juices from plants
noun: a person who has a nasty or unethical character undeserving of respect
noun: wingless insect with mouth parts adapted for biting; mostly parasitic on birds