the world > matter > physics > electromagnetic radiation > electricity > electrical appliances or devices > [noun] > timer (3)
A device or instrument that emits a ding (ding, n.3 2), typically as an alert or reminder; esp. a timer on a microwave or conventional oven.
(a) a photoelectric timer for regulating exposure time in radiography; (b) a timer for races incorporating a camera which photographs the finish.
An instrument which emits a ping or pings, esp. as a warning or reminder; spec. a kitchen timer.