thermionic tube


noun Electronics.

a vacuum tube in which the cathode is heated electrically to cause the emission of electrons by thermal agitation.
Also called hot-cathode tube.

Origin of thermionic tube

First recorded in 1925–30

Scientific definitions for thermionic tube

thermionic tube
[ thûr′mī-ŏnĭk ]

An electrical component, typically an electron tube, through which electric current flows via the emission of thermions from a heated cathode.