noun anything extremely hard, unimpressible, and unyielding, like flint.
2. flint ·noun a piece of flint for striking fire;
formerly much used, ·esp. in the hammers of gun locks.
3. 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.