Wiktionary
n. A worm and wheel, a gear arrangement consisting of a screw (the worm) whose thread meshes with a gear wheel to turn the direction of drive through a right angle, typically with a large (1:10 - 1:60) speed reduction and similar torque increase.
Wikipedia
A worm drive is a gear arrangement in which a worm (which is a gear in the form of a screw) meshes with a worm gear (which is similar in appearance to a spur gear). The two elements are also called the worm screw and worm wheel. The terminology is often confused by imprecise use of the term worm gear to refer to the worm, the worm gear, or the worm drive as a unit.
Like other gear arrangements, a worm drive can reduce rotational speed or transmit higher torque. The image shows a section of a gear box with a worm gear driven by a worm. A worm is an example of a screw, one of the six simple machines.
Usage examples of "worm drive".
At least two could be the remains of routine solar-system lander power supplies, and a third could even be the remnants of an interstellar worm drive.
It has a giggle bite of rum, three and a half tear a bites of rain, bubble mammary, super-seedy worm drive, and can perform some preposterously high number of trips.
It has a giggle bite of rum, three and a half tear a bites of ram, bubble mammary, super-seedy worm drive, and can perform some preposterously high number of trips.