noun
: a large emergency valve at the bottom of a container (as an airplane fuel tank) by which it may be emptied much more quickly than by the ordinary drain cock (as in emergency jettisoning of fuel)
noun
: a large emergency valve at the bottom of a container (as an airplane fuel tank) by which it may be emptied much more quickly than by the ordinary drain cock (as in emergency jettisoning of fuel)
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012