a device with pointed metal projections worn over the shoes to provide traction when walking over ice, or in mountaineering; -- usually used in the plural. [PJC]
Crampon, n. (US crampoon) (usu. in pl.)
1 an iron plate with spikes fixed to a boot for walking on ice, climbing, etc.
2 a metal hook for lifting timber, rock, etc.; a grappling-iron.