noun Mountain Climbing.
a metal spike with an eye through which a rope may be passed.

1895–1900; < French: ringbolt, peak (of a mountain)

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World English Dictionary
piton (ˈpiːtɒn, French pitɔ̃)
mountaineering a metal spike that may be driven into a crevice of rock or into ice and used to secure a rope
[C20: from French: ringbolt]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1898, from Fr. piton "hook, peak, piton," from O.Fr. "nail, hook," from V.L. root *pitt- "point, peak."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
In your hand is an ice hammer, and a piton or ice screw for securing a belay rope to the top.
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