D defs.my
Entry 2 senses Webster, 1913

Timer

/tīm'-ẽr/ · Tim·er · IPA /ˈtaɪmɚ/
01 n. A timekeeper; especially, a watch by which small intervals of time can be measured; a kind of stop watch. It is used for timing the speed o…
  1. 1.
    A timekeeper; especially, a watch by which small intervals of time can be measured; a kind of stop watch. It is used for timing the speed of horses, machinery, etc.
  2. 2.
    In electric ignition, an adjustable device for automatically timing the spark.(Internal-combustion Engines)