purser

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

• noun The officer in charge of money matters on board a ship or commercial aircraft.

from The Century Dictionary.

• noun An official charged with the keeping of accounts and the disbursing of money; specifically, an officer who keeps the accounts of a ship, and has charge of the provisions, pay, etc.: now called in the navy paymaster.
• noun In mining, the paymaster or cashier of a mine, and the official to whom notices of transfer are sent for registration in the cost-book.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Naut.) A commissioned officer in the navy who had charge of the provisions, clothing, and public moneys on shipboard; -- now called paymaster.
• noun A clerk on steam passenger vessels whose duty it is to keep the accounts of the vessels, such as the receipt of freight, tickets, etc.
• noun Colloquially, any paymaster or cashier.
• noun (Naut.), [Slang] a false name.

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

• noun The person responsible for handling the accounts on a ship, or for dealing with the passengers on a ship or aircraft.

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

• noun an officer aboard a ship who keeps accounts and attends to the passengers' welfare