Petard(redirected from P tard)
Also found in: Dictionary, Thesaurus.
a charge of compacted black powder placed in a metal or cardboard casing. A petard is used in primer cups to transmit fire from the friction primer to the powder charge located in the artillery shell case. In time fuses, the petard transmits fire from the delay element to the detonator. A petard may also be used for creating sound effects in fireworks.