noun
female employee of a brothel-massage parlor
Refers specifically to a woman working at a ヘルス (a type of sex business offering massage-like services). The term is a compound of ヘルス (from 'health', a euphemism for such establishments) and 嬢 (a suffix for young women in service roles).
彼は週末になると、よくヘルス嬢を指名しているらしい。
He apparently often requests a specific girl at the brothel-massage parlor on weekends.
ヘルス嬢として働く女性たちの労働環境は、あまり知られていない。
The working conditions of women employed as brothel-massage parlor workers are not widely known.