noun
chaplain
CHAP-lin/ˈtʃæplɪn/
A clergy member serving an institution, military unit, or organization.
The chaplain listens beside the patient's hospital bed.

Etymology
A chapel minister also served private religious needs, especially in great households. That role broadened to clergy attached to institutions such as military units and prisons rather than to an ordinary parish.
In context
Bread and water for six weeks from now to the Feast of Saint Benedict, with a daily exhortation from our chaplain, the pious Father Ambrose, may still avail to bend the stiff neck