carabiner
noun
car·a·bi·ner
ˌker-ə-ˈbē-nər
ˌka-rə-
variants
or less commonly karabiner
: a usually D-shaped or oblong metal ring with one spring-hinged side that is used especially in mountain climbing as a connector and to hold a freely running rope
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Merriam-Webster unabridged
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