Prusik

A Prusik k is a friction hitch or knot used to put a loop of cord around a rope, applied in climbing, canyoneering, mountaineering, caving, rope rescue, and by arborists. The term Prusik is a name for both the loops of cord and the hitch, and the verb is `to prusik`. More casually, the term is used for any friction hitch or device that can grab .....
Found on http://en.wikipedia.org/wiki/Prusik

Prusik

(prussik, prussick, prussic) A sliding friction knot used to anchor a small diameter rope to a large diameter rope, also, to ascend a rope with prusik slings. The knot bears the last name of the Austrian climber who devised it.
Found on http://santiamalpineclub.org/mountain/climbing/terms/

prusik

A loop of thin cord, itself looped several times around a thicker rope. Used by climbers to attach themselves or anything else to a rope via a carabiner in such a way that it can be slid along the rope but, if weight is put on it, it locks in place through friction. Also verb: to climb up a rope using 2 prusiks alternately, one attached to the clim...
Found on http://snowheads.com/ski-forum/viewtopic.php?p=1814905
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