Definitions
1.nounA hard, fine-grained quartz that fractures conchoidally and generates sparks when struck.
2.nounA piece of flint, such as a gunflint, used to produce a spark by striking it with a firestriker.
3.nounA small cylinder of some other material of the same function in a cigarette lighter, etc.
4.nounA type of maize/corn with a hard outer hull.
5.nounAnything figuratively hard.
6.verbTo furnish or decorate an object with flint.