Source : Webster's Revised Unabridged Dictionary (1913)

Chaser \Chas"er\, n.
   1. One who or that which chases; a pursuer; a driver; a
      hunter.

   2. (Naut.) Same as {Chase gun}, esp. in terms bow chaser and
      stern chaser. See under {Bow}, {Stern}.

Chaser \Chas"er\, n.
   1. One who chases or engraves. See 5th {Chase}, and
      {Enchase}.

   2. (Mech.) A tool with several points, used for cutting or
      finishing screw threads, either external or internal, on
      work revolving in a lathe.

Source : WordNet®

chaser
     n 1: a person who is pursuing and trying to overtake or capture;
          "always before he had been able to outwit his pursuers"
          [syn: {pursuer}]
     2: a drink to follow immediately after another drink