A gear with a small number of teeth designed to mesh with a larger geared wheel or a rack Used in rack and pinion steering and the differential ring and pinion
If you are pinioned, someone prevents you from moving or escaping, especially by holding or tying your arms. At nine the next morning Bentley was pinioned, hooded and hanged. to hold or tie someone's arms or legs very tightly, so that they cannot move freely. a small wheel, with teeth on its outer edge, that fits into a larger wheel and turns it or is turned by it
(n) The smaller of two gears in a meshed pair of gears The larger of the two gears is simply called the gear A gear and pinion pair is used to change the speed of shaft rotation, with the pinion shaft rotating at a higher rate than the gear shaft
a gear with a small number of teeth designed to mesh with a larger wheel or rack