From Middle English lows(e), from Old English lūs, from Proto-Germanic *lūs (compare West Frisian lûs, Dutch luis, Low German Luus, German Laus, from Proto-Indo-European *lewH- (compare Welsh llau (“lice”), Tocharian B luwo, maybe Sanskrit यूका (yūkā)).
- A small parasitic wingless insect of the order Phthiraptera.
- (colloquial, dated, not usually used in plural form) A contemptible person; one who has recently taken an action considered deceitful or indirectly harmful.
- It's then that those louses go back to their spouses, Diamonds are a girl's best friend
- When used as a term of abuse, the plural is louses.