refectory

A room where meals are served, especially in a college or other institution.

A room of refreshment; an eating-room; specifically, a hall or apartment in a convent, monastery, or seminary where the meals are eaten. Compare fraiter.

A room for refreshment; originally, a dining hall in monasteries or convents.

A dining–hall especially in an institution such as a college or monastery.

a communal dining-hall (usually in a monastery)