A triode is an electronic device that has three electrodes- cathode, anode, and grid. Some of the synonyms that can be used for the word triode are vacuum tube, valve, and electron tube. These synonyms are commonly used in the field of electronics and electrical engineering. Another synonym that can be used is amplifying tube, which denotes the function of the triode. Vacuum tube is a term that is often used by professionals in the industry to describe triodes that work using vacuum technology. All in all, there are a multitude of synonyms that can be used for the term triode, making it easier for individuals to describe and communicate about the electronic device.