1. An explosive machine made of metal, formerly used for breaking gates or barricades.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• leatard,
• peiord,
• pesterd,
• redard,
• peerd,
• returd,
• pertand,
• retaird,
• pitard,
• petar,
• teard,
• perpard,
• petend,
• peted,
• retaerd,
• petry,
• petorl,
• peasd,
• letered,
• peard

The adjective form of the word "petard" is "petardian". However, it is not a commonly used adjective and may not be widely recognized.

The plural of the "petard" can be the "petards".

The singular of the "petard" can be the "petard".