noun
: a pipe placed vertically or nearly so and connected to the traps of plumbing fixtures in such a manner as to ventilate them and prevent the water seal from being siphoned out of them
noun
: a pipe placed vertically or nearly so and connected to the traps of plumbing fixtures in such a manner as to ventilate them and prevent the water seal from being siphoned out of them
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012