from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A metal spike fitted at one end with an eye for securing a rope and driven into rock or ice as a support in mountain climbing.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a spike, wedge, or peg that is driven into a rock or ice surface as a support (as for a mountain climber)
- v. to put pitons into a rock/ice to facilitate climbing
from the GNU version of the Collaborative International Dictionary of English
- n. A metal spike having a sharpened point on one end, and a hole through which a rope can be passed on the other; it is driven into the face of a rock cliff during climbing, and used as an anchor point for a rope.
from The Century Dictionary and Cyclopedia
- n. A point; a peak.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a metal spike with a hole for a rope; mountaineers drive it into ice or rock to use as a hold
French, from Old French, nail.(American Heritage® Dictionary of the English Language, Fourth Edition)
French piton ("nail") (Wiktionary)