noun
prison chaplain
A religious worker who provides spiritual guidance and moral instruction to inmates in a correctional facility.
教誨師は受刑者に宗教的な教えを説く。
The prison chaplain preaches religious teachings to the inmates.
彼は刑務所の教誨師として長年勤めた。
He worked for many years as a prison chaplain.
From 教誨 (kyōkai, 'instruction; admonition') + 師 (shi, 'teacher; master'). The term is specifically used for chaplains in prisons.