FLINT, n.
1. In natural history, a sub-species of quartz, of a yellowish or bluish gray, or grayish black color. It is amorphous, interspersed in other stones, or in nodules or rounded lumps. Its surface is generally uneven, and covered with a rind or crust, either calcarious or argillaceous. It is very hard, strikes fire with steel, and is an ingredient in glass.
2. A piece of the above described stone used in firearms to strike fire.
3. Any thing proverbially hard as a heart of flint.
The King James Bible has stood its ground for nearly 400 years. However, during that time the English language has changed, and with it the meanings of some words it used. Here are more than 6,500 words whose definitions have changed since 1611.Wikipedia
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