n. A slender form of drill used for boring or drilling a blast-hole in rock.n. A priming-wire or blasting-needle.n. The name given near Mont Blanc to the sharper peaks or clusters of needle-like rock-masses, ordinarily seen wherever the slaty crystalline rocks occur, forming a more or less considerable part of a mountain range, but most strikingly near Chamonix. Hence applied, though rarely, to similar sharply pointed peaks elsewhere.