tim·er

[tahy-mer]
noun
1.
a person or thing that times.
2.
a person who measures or records time.
3.
a device for indicating or measuring elapsed time, as a stopwatch.
4.
a device for controlling machinery, appliances, or the like, in a specified way at a predetermined time: Please put the roast in the oven and set the timer to cook it for two hours.
5.
(in an internal-combustion engine) a set of points actuated by a cam, which causes the spark for igniting the charge at the instant required.

Origin:
1490–1500; time + -er1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To timer
00:10
Timer is always a great word to know.
So is doohickey. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a gadget; dingus; thingumbob.
Collins
World English Dictionary
timer (ˈtaɪmə) [Click for IPA pronunciation guide]
 
n
1.  a device for measuring, recording, or indicating time
2.  a switch or regulator that causes a mechanism to operate at a specific time or at predetermined intervals
3.  a person or thing that times

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
One of the last levels is a timed one, which challenges you to complete the
  objectives before the timer reaches zero.
Thread the timer tape through the timer and use masking tape to attach the
  ticker tape to the vehicle.
As contestants finished, they smacked a timer, then closed their eyes and put
  their heads down on the table.
The clock also works as an alarm clock and sleep timer.
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