certified check

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

• noun A check guaranteed by a bank to be covered by sufficient funds on deposit.

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

• noun a check drawn on a bank and bearing marks from that bank guaranteeing that funds have been reserved for payment.

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

• noun a check containing certification that the person who issued the check has sufficient funds on deposit to cover payment