slow match

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

• noun A match or fuse that burns slowly at a known rate and is used to set off explosives or fire cannons and muzzle-loading firearms.

from The Century Dictionary.

• noun A match so composed as to burn very slowly and at a regular fixed rate: it is generally prepared by soaking or boiling rope or cord of some sort in a solution of saltpeter.

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

• noun A slow-burning fuse used to ignite a matchlock musket or fire a cannon.

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

• noun match or fuse made to burn slowly and evenly