flint

flint /ˈflɪnt/ noun
plural flints
flint
/ˈflɪnt/
noun
plural flints
Britannica Dictionary definition of FLINT
1 
a  [noncount] : a hard type of rock that produces a small piece of burning material (called a spark) when it is hit by steel
b  [count] : a piece of flint
2 
[count] : a piece of metal used for producing a spark