This is the 13309th most frequent Russian word.
мужского
"Мужского" means "male" or "masculine" in English.
Here, 'мужского' (male) is used as an adjective, modifying the noun 'здравойства' (health).
Он читал книгу о мужского здравойства.
He was reading a book about male health.
In this sentence, 'мужского' describes the type of voice, gender-specific to males.
Лаборатория изучала характеристики мужского голоса.
The laboratory studied the characteristics of the male voice.
The term 'мужского' is used attributively to specify the department as male-focused.