noun
: a small thin ring of metal (as gold or platinum) placed under the balance screws of a watch to slow the vibration period of the balance or to help poise it
noun
: a small thin ring of metal (as gold or platinum) placed under the balance screws of a watch to slow the vibration period of the balance or to help poise it
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012