noun
: a narrow luminous region that occurs in an electrical discharge in a gas at low pressure (as in a Crookes tube) and that is often the second such region from the cathode
noun
: a narrow luminous region that occurs in an electrical discharge in a gas at low pressure (as in a Crookes tube) and that is often the second such region from the cathode
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012