lighter fluid

noun

Definition of lighter fluid

1 : the liquid in a lighter (such as a cigarette lighter) that is its fuel
2 : a liquid accelerant used especially to ignite charcoal briquettes for grilling food The average back-yard chef, wishing to cook hamburgers, tries to ignite the charcoal via the Squirt, Light and Wait Method, wherein you squirt lighter fluid on a pile of briquettes, light the pile, then wait until they have turned a uniform grey.— Dave Barry

First Known Use of lighter fluid

1922, in the meaning defined at sense 1

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The first known use of lighter fluid was in 1922

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