ETYM French See Crampoons.
1. A hinged pair of curved iron bars; used to raise heavy objects; spiked grip for carrying blocks of stone, ice, etc. SYN. crampoon.
2. An iron spike attached to the shoe to prevent slipping on ice when walking or climbing; SYN. crampoon, climbing iron, climber.
3. Boot-spike for rock and ice climbing.

Aerial root.