louse
n. US //ˈɫaʊs// UK //lˈaʊs// louse
From Middle English lous, lows, lowse, from Old English lūs, from Proto-West Germanic lūs, from Proto-Germanic lūs, from Proto-Indo-European *lewH-. See also West Frisian lûs, Dutch luis, German Low German Luus, German Laus; also Welsh llau (“lice”), Tocharian B luwo, maybe Sanskrit यूका (yūkā).