'Timer' definitions:

Definition of 'timer'

From: WordNet
noun
A timepiece that measures a time interval and signals its end
noun
(sports) an official who keeps track of the time elapsed [syn: timekeeper, timer]
noun
A regulator that activates or deactivates a mechanism at set times

Definition of 'Timer'

From: GCIDE
  • Timer \Tim"er\, n.
  • 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. [1913 Webster]
  • 2. (Internal-combustion Engines) In electric ignition, an adjustable device for automatically timing the spark. [Webster 1913 Suppl.]

Synonyms of 'timer'

From: Moby Thesaurus