noun
: a bank indicator consisting of a slightly curved tube in which a ball remains centered while the airplane is flying straight and level or while the airplane is making a properly banked turn
noun
: a bank indicator consisting of a slightly curved tube in which a ball remains centered while the airplane is flying straight and level or while the airplane is making a properly banked turn
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012