custodian

plural custodians

1. A person entrusted with the custody or care of something or someone; a caretaker or keeper.

   After their parents' death, their aunt became the children's custodian.

   3 more examples

   The building's custodian could fix nearly anything. The place always looked great!

   The middle class is the. demitone of human society, custodian of the balance, and no fair social order could exist without the cooperation of this class.

   1947, David Saavedra, Go South Young Man, page 80

   Dr. Weber and her colleagues are the latest custodians of the Beal seed viability experiment: a multicentury attempt to figure out how long seeds can lie dormant in the soil without losing their ability to germinate.

   2021 April 21, Cara Giaimo, “One of the World’s Oldest Science Experiments Comes Up From the Dirt”, in The New York Times, archived from the original on 27 Apr 2021

2. An administrator.
3. A gaolkeeper.
4. A protector or guard.
5. CanadaUSA janitor; a cleaner.