stop·watch

[stop-woch]
noun
a watch with a hand or hands that can be stopped or started at any instant, used for precise timing, as in races.

Origin:
1730–40; stop + watch

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
stopwatch (ˈstɒpˌwɒtʃ) [Click for IPA pronunciation guide]
 
n
a type of watch used for timing events, such as sporting events, accurately, having a device for stopping the hand or hands instantly

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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00:10
Stopwatch is always a great word to know.
So is doohickey. Does it mean:
a gadget; dingus; thingumbob.
a stew of meat, vegetables, potatoes, etc.
Etymonline
Word Origin & History

stopwatch
also stop-watch, 1737, from stop + watch (n.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Using the stopwatch, measure how long each plane stays in the air.
In the old days the thing dropped through the efforts of six burly workmen and
  a guy with a stopwatch.
Start and end your meetings according to a stopwatch that everyone in the room
  can see.
One stopwatch is designated as the official test time stopwatch, the second is
  the backup stopwatch.
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