tim ‧ er /ˈtaɪmə $ -ər/ BrE AmE noun [countable]
[ Word Family: noun : ↑ time , ↑ overtime , ↑ timer , ↑ timing , ↑ timelessness ; adjective : ↑ timeless , ↑ timely ≠ ↑ untimely ; verb : ↑ time ; adverb : ↑ timelessly ]
1 . an instrument that you use to measure time, when you are doing something such as cooking:
Set the timer on the cooker for three minutes.
⇨ ↑ egg-timer
2 . part-timer/full-timer someone who works part or all of a normal working week