from the GNU version of the Collaborative International Dictionary of English
- n. An arm attached to a swinging notched arc or rack, to let off the striking mechanism of a repeating clock.
from The Century Dictionary and Cyclopedia
- n. In a repeating (clock, a bent arm connected with the striking-mechanism, having a pin at its end which drops upon the notched wheel that determines the number of strokes.
Sorry, no etymologies found.