triode adjective & noun. ['trʌɪǝʊd] L19.
[from TRI- + -ODE².]
A. adjective. Telegraphy. Permitting or involving the transmission of three signals simultaneously. Only in L19.
b. noun. Electronics. A thermionic valve having three electrodes (also triode valve). Also, an analogous semiconductor device with three terminals. E20.

Comb.:
triode-hexode, triode-pentode a valve containing a triode and a hexode, pentode, in a single envelope, with separate anodes but a common cathode.

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