n. 攻城炸药, 爆竹

[ noun ]
an explosive device used to break down a gate or wall
<noun.artifact>

Petard \Pe*tard"\, n. [F. p['e]tard, fr. p['e]ter to break wind,
to crack, to explode, L. pedere, peditum.] (Mil.)
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 It has been superseded.