Meaning

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

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

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

originFrom Middle English lous, lows, lowse, from Old English lūs, from Proto-West Germanic *lūs, from Proto-Germanic *lūs, from Proto-Indo-European *lewH-. Cognate with West Frisian lûs, Dutch luis, German Low German Luus, German Laus, Danish, Norwegian Bokmål, Norwegian Nynorsk, and Swedish lus, Faroese and Icelandic lús; also Welsh llau (“lice”), Tocharian B luwo, maybe Sanskrit यूका (yūkā).

Etymology from Wiktionary, CC BY-SA 3.0