the head, or forward section, of a torpedo, bomb, or other projectile, containing the explosive charge, chemical, etc.
See warhead in American Heritage Dictionary 4
noun
A part of the armament system in the forward part of a projectile, such as a guided missile, rocket, torpedo, bomb, or other munition, that contains either a nuclear or thermonuclear system, a high explosive system, chemical or biological agents, or inert materials intended to inflict damage on a target.