noun
: a mainspring barrel in a watch or clock that has teeth on its periphery for driving the train and that is mounted on an arbor which is stationary except during winding
noun
: a mainspring barrel in a watch or clock that has teeth on its periphery for driving the train and that is mounted on an arbor which is stationary except during winding
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012