certified check

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A check guaranteed by a bank to be covered by sufficient funds on deposit.

GNU Webster's 1913

1. n. a check drawn on a bank and bearing marks from that bank guaranteeing that funds have been reserved for payment.
2. v. A bank check, the validity of which is certified by the bank on which it is drawn.

WordNet 3.0

1. n. a check containing certification that the person who issued the check has sufficient funds on deposit to cover payment