noun
A professional who cuts men's hair and shaves or trims beards. More formal than 床屋 (とこや).
彼は理髪師として30年働いている。
He has been working as a barber for 30 years.
理髪師にひげをそってもらった。
I had the barber shave my beard.
美容師 is a beautician or hairdresser, typically for women's hair styling, whereas 理髪師 is specifically a barber for men.
Compound of 理髪 (rihatsu, 'haircut, hairdressing') + 師 (shi, 'master, specialist').