wormgear

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

Dictionary.com Unabridged
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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