noun. a thermionic vacuum tube having three electrodes; fluctuations of the charge on the grid control the flow from cathode to anode which makes amplification possible.
- thermionic vacuum tube
- vacuum tube
- thermionic valve
- electron tube
Example sentences of the word triode
1. Noun, singular or mass
Unlike the triode which has three elements, the Audion only had two and did not amplify sound.