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trioecious
triol
triolein
triolet

triode  n 
1 an electronic valve having three electrodes, a cathode, an anode, and a grid, the potential of the grid controlling the flow of electrons between the cathode and anode. It has been replaced by the transistor 
2 any electronic device, such as a thyratron, having three electrodes 
 (C20: tri- + electrode)