noun
: a clock with a slow torsion pendulum that enables it to run as long as 400 days on a single winding — called also four-hundred-day clock
noun
: a clock with a slow torsion pendulum that enables it to run as long as 400 days on a single winding — called also four-hundred-day clock
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012