[noun] [C] - a person with responsibility for the care, protection or maintenance of somethingthe custodian of a museum/castlethe custodian of the Queen's jewels(figurative) Mary Whitehouse sees herself as the custodian of public morals.Custodian is also US for caretaker (BUILDING WORKER).
CUSTODIAN
Meaning of CUSTODIAN in English
Cambridge English vocab. Кембриджский английский словарь. 2012