Source : Webster's Revised Unabridged Dictionary (1913)

Alpenstock \Al"pen*stock`\, n. [G.; Alp, gen. pl. Alpen + stock
   stick.]
   A long staff, pointed with iron, used in climbing the Alps.
   --Cheever.

Source : WordNet®

alpenstock
     n : a stout staff with a metal point; used by mountain climbers