cabin boy

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A boy servant aboard a ship.

from The Century Dictionary.

• noun A boy employed to wait on the officers and passengers in the cabin of a ship.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun dated A boy or young man who is employed to serve as an attendant for passengers or crew members on a ship.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a young man acting as a servant on a ship