Source : Webster's Revised Unabridged Dictionary (1913)

Destroyer \De*stroy"er\, n. [Cf. OF. destruior.]
   One who destroys, ruins, kills, or desolates.

Destroyer \De*stroy"er\, n.
   = {Torpedo-boat destroyer}.

Source : WordNet®

destroyer
     n 1: a small fast lightly armored but heavily armed warship [syn:
           {guided missile destroyer}]
     2: a person who destroys or ruins or lays waste to; "a
        destroyer of the environment"; "jealousy was his undoer";
        "uprooters of gravestones" [syn: {ruiner}, {undoer}, {waster},
         {uprooter}]