• WordNet 3.6
    • n ignitor a device for lighting or igniting fuel or charges or fires "do you have a light?"
    • n ignitor a substance used to ignite or kindle a fire
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Webster's Revised Unabridged Dictionary
    • n Ignitor One who, or that which, produces ignition; especially, a contrivance for igniting the powder in a torpedo or the like.
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In news:

Protective Devices The S1 Safeguard ignitor turn-off switch increases ballast life by eliminating continuous high-voltage pulses caused by end-of-life, defective, or missing lamps.

In science:

Bombarda discussed IGNITOR, which will be able to ignite a plasma.
Summary Talk of the X Latin American Workshop on Plasma Physics