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, worm·gear.

Origin:
1875–80

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Worm gear is always a great word to know.
So is doohickey. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a gadget; dingus; thingumbob.
LEARN MORE UNUSUAL WORDS WITH WORD DYNAMO...
Example sentences
The linkage shall be driven by a fully enclosed, double reduction, worm gear
  speed reducer.
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.
Sample distribution shall be through the use of a worm gear drive mechanism.
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