cham·ber·lain 
(chāmbər-lən)
(chāmbər-lən)n.
1.
a. An officer who manages the household of a sovereign or noble; a chief steward.
b. A high-ranking official in various royal courts.
2. An official who receives the rents and fees of a municipality; a treasurer.
3. Roman Catholic Church
a. A papal gentleman. No longer in use.
b. A camerlengo.
[Middle English chaumberlein, from Old French chamberlenc, from Frankish *kamerling : Late Latin camera, chamber; see CHAMBER + Germanic *-linga-, one connected with; see -LING1.]