a person or thing that ignites.
Electronics. the carborundum rod used to initiate the discharge in an ignitron tube.

1880–85; ignite + -er1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
igniter (ɪɡˈnaɪtə)
1.  a person or thing that ignites
2.  a fuse to fire explosive charges
3.  an electrical device for lighting a gas turbine
4.  a subsidiary electrode in an ignitron

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Pop off the igniter, plug it in and let the downloads commence.
Don't drive it in too deeply or you risk damaging the igniter.
The red firing handle will connect to the activation housing, the flexible
  cable that links the firing handle to the igniter.
Place the flask in the safety igniter and position so that the filter paper
  will be in line with the infra-red beam.
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