chockstone

== English == === Etymology === From chock +‎ stone. The climbing sense derives from the wedges' use as artificial chockstones. === Pronunciation === (UK) IPA(key): /ˈtʃɒkstəʊn/ (General American) IPA(key): /ˈt͡ʃɑkstoʊn/ === Noun === chockstone (plural chockstones) A stone, ranging in size from a boulder to a pebble, which has become wedged in a vertical fissure or cleft. (climbing) A metal wedge or nut, threaded on a wire, used in rock climbing for protection by wedging it into a crack in the rock. Coordinate term: piton === Further reading === nut (climbing) on Wikipedia.Wikipedia