thermionic

adjective
therm·​ion·​ic | \ˌthər-(ˌ)mī-ˈä-nik \

Definition of thermionic 

: relating to, using, or being the emission of charged particles (such as electrons) by an incandescent material

First Known Use of thermionic

1909, in the meaning defined above

History and Etymology for thermionic

thermion charged particle from an incandescent source, from therm- + ion

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The first known use of thermionic was in 1909

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