·noun Anything extremely hard, unimpressible, and unyielding, like flint.
II. Flint ·noun A piece of flint for striking fire;
— formerly much used, ·esp. in the hammers of gun locks.
III. Flint ·noun A massive, somewhat impure variety of quartz, in color usually of a gray to brown or nearly black, breaking with a conchoidal fracture and sharp edge. It is very hard, and strikes fire with steel.