Old English flint, from Proto-Germanic *flintaz (compare Middle Dutch vlint, Old High German flins, Danish flint), from Proto-Indo-European *splind- (“to split, cleave”) (compare Irish slinn (“slate, shingle”), Ancient Greek πλίνθος (plinthos)), from *(s)plei- (“to split”). More at split.
flint (plural flints)
- A hard, fine-grained quartz that fractures conchoidally and generates sparks when struck.
- A piece of flint, such as a gunflint, used to produce a spark.
- A small cylinder of some other material of the same function in a cigarette lighter, etc.
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- (transitive) To furnish or decorate an object with flint.