noun
: a partially evacuated tube provided with electrodes so that its conductivity due to the ionization of the residual gas reveals the presence of ionizing radiation (as X rays or beta rays)
noun
: a partially evacuated tube provided with electrodes so that its conductivity due to the ionization of the residual gas reveals the presence of ionizing radiation (as X rays or beta rays)
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012