noun
or walk-around oxygen bottle also walk-around oxygen unit or walk-around
( -s )
: a portable container of oxygen for use in high-altitude flying when moving around in the airplane or as an emergency supply if the airplane's oxygen system fails
noun
or walk-around oxygen bottle also walk-around oxygen unit or walk-around
( -s )
: a portable container of oxygen for use in high-altitude flying when moving around in the airplane or as an emergency supply if the airplane's oxygen system fails
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012