karabiner

Noun
  1. An oblong metal ring with a spring clip;
    Used in mountaineering to attach a rope to a piton or to connect two ropes (synset 102964126)
    is a type of:
    • fastener, fastening, fixing, holdfast - restraint that attaches to something or holds something in place
    • hoop, ring - a rigid circular band of metal or wood or other material used for holding or fastening or hanging or pulling
    same as: carabiner, snap ring

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