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

Definition of thermionic

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

Origin and Etymology of thermionic

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

First Known Use: 1909

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