noun
: the electron-emitting cathode and its surrounding assembly in a cathode-ray tube for directing, controlling, and focusing the stream of electrons to a spot of desired size
noun
: the electron-emitting cathode and its surrounding assembly in a cathode-ray tube for directing, controlling, and focusing the stream of electrons to a spot of desired size
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012