Whĭn'-stōne, n.

n. [From whin and stone; Scot. quhynstane.] (Geol.) Trap or green-stone; — a provincial name given to basaltic rocks, and applied by miners to any kind of dark-colored and hard, unstratified rock, which resists the point of the pick. Veins of dark basalt, or green-stone, are frequently called whyn-dikes.