Home › Words › T › tetrodetetrode/ˈtɛtɹəʊd/tetrode · noun — A thermionic valve similar to a triode with the addition of a screen grid to improve the thermionic emission.Definition from Wiktionary (CC BY-SA 3.0).Among words judged in Lexicurio's Arena, tetrode ranks #17,050 of 43,201 for Qualifying.tetrode is pronounced /ˈtɛtɹəʊd/.EtymologyFrom tetr- + -ode.nounA thermionic valve similar to a triode with the addition of a screen grid to improve the thermionic emission.A dynatron.A dual-gate MOSFET.Definitions & examples from Wiktionary (CC BY-SA 3.0).