say it: TAHY-mur
timer is a noun meaning "a timepiece that measures a time interval and signals its end". It carries 3 recorded senses.
a timepiece that measures a time interval and signals its end
(sports) an official who keeps track of the time elapsed
sport
a regulator that activates or deactivates a mechanism at set times
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for timer come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.