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Wiktionary
tensioner

n. Any device that maintains or applies tension

Wikipedia
Tensioner

A tensioner is a device that applies a force to create or maintain tension. The force may be applied parallel to, as in the case of a hydraulic bolt tensioner, or perpendicular to, as in the case of a spring-loaded bicycle chain tensioner, the tension it creates. The force may be generated by a fixed displacement, as in the case of an eccentric bicycle bottom bracket, which must be adjusted as parts wear, or by stretching or compressing a spring, as in the case of a spring-loaded bicycle chain tensioner; by changing the volume of a gas, as in the case of a marine riser tensioner; by hydraulic pressure, as in the case of a hydraulic bolt tensioner; or by gravity acting on a suspended mass, as in the case of a chair lift cable tensioner.

Usage examples of "tensioner".

Several tight spirals by Grenier brought them near enough to a stale position that Quantrill could ease off the cable tensioner and hit the quick-release when his feet neared the rank grass that invaded from nearby prairies.

I failed - I'm not patient enough - but I learned some of the technique and the names of the picks: the half-round and round feelers, the rakes and diamonds and double diamonds, the readers, extractors, mailboxes, flat levers and tensioners, circulars and points.