louse meaning and definition

LOUSE noun

Definition of louse (noun)

1. wingless usually flattened bloodsucking insect parasitic on warm-blooded animals
   • synonyms: sucking louse
2. a person who has a nasty or unethical character undeserving of respect
   • synonyms: dirt ball, insect, worm
3. any of several small insects especially aphids that feed by sucking the juices from plants
   • synonyms: plant louse
4. wingless insect with mouth parts adapted for biting; mostly parasitic on birds
   • synonyms: bird louse, biting louse