louse

Noun

• wingless insect with mouth parts adapted for biting; mostly parasitic on birds

• any of several small insects especially aphids that feed by sucking the juices from plants

• a person who has a nasty or unethical character undeserving of respect

• wingless usually flattened bloodsucking insect parasitic on warm-blooded animals

Related words

• Synonyms: 
  bird louse , biting louse , plant louse , worm , insect , dirt ball , sucking louse