1.  slasher(n = noun.person) - someone who slashes another person;
is a kind of aggressor, assailant, assaulter, attacker
Derived form verb slash₁

2.  slasher(n = noun.artifact) - a weapon (a sword or dagger) used for slashing;
is a kind of arm, weapon, weapon system

   A machine for applying size to warp yarns. [1913 Webster]