Source : Webster's Revised Unabridged Dictionary (1913)

Tick \Tick\, n.
   1. A quick, audible beat, as of a clock.

   2. Any small mark intended to direct attention to something,
      or to serve as a check. --Dickens.

   3. (Zo["o]l.) The whinchat; -- so called from its note.
      [Prov. Eng.]

   {Death tick}. (Zo["o]l.) See {Deathwatch}.