worm gear

noun
1.
a mechanism consisting of a worm engaging with and driving a worm wheel, the two axes usually being at right angles, used where a relatively low speed and a relatively large amplification of power are desired.
2.
Also called worm wheel. a gear wheel driven by a worm.
Also, wormgear.


Origin:
1875–80

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
worm gear
 
n
1.  a device consisting of a threaded shaft (worm) that mates with a gearwheel (worm wheel) so that rotary motion can be transferred between two shafts at right angles to each other
2.  Also called: worm wheel a gearwheel driven by a threaded shaft or worm

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Example sentences
The gear housing shall be divided horizontally at the center line of shaft to
  provide access to the worm gear.
Securely fasten flexible connections to round ducts with stainless steel or
  zinc-coated iron draw bands with worm gear fastener.
Securely fasten flexible connections to round ducts with stainless steel or
  zinc coated iron draw bands with worm gear fastener.
The linkage shall be driven by a fully enclosed, double reduction, worm gear
  speed reducer.
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