Source : Webster's Revised Unabridged Dictionary (1913)

Flinty \Flint"y\, a. [Compar. {Flintier}; superl. {Flintiest}.]
   Consisting of, composed of, abounding in, or resembling,
   flint; as, a flinty rock; flinty ground; a flinty heart.

   {Flinty rock}, or {Flinty state}, a siliceous slate; --
      basanite is here included. See {Basanite}.