Function: noun
Date: 1924
: an electron-emitting cathode and its surrounding assembly (as electromagnets in a cathode-ray tube) for directing, controlling, and focusing a beam of electrons
Function: noun
Date: 1924
: an electron-emitting cathode and its surrounding assembly (as electromagnets in a cathode-ray tube) for directing, controlling, and focusing a beam of electrons
Merriam Webster Collegiate English Dictionary. Merriam Webster - Энциклопедический словарь английского языка. 2012