D defs.my
Entry 1 sense Webster, 1913

Petard

/pĕt'-ẽrd/ · Pe·tard · IPA /pɪˈtɑɹd/
01 n. A case containing powder to be exploded, esp. a conical or cylindrical case of metal filled with powder and attached to a plank, to be expl…
  1. 1.
    A case containing powder to be exploded, esp. a conical or cylindrical case of metal filled with powder and attached to a plank, to be exploded against and break down gates, barricades, drawbridges, etc. It has been superseded.(Mil.)