Portuguese
valvula termionica Catalan
vàlvula 
Electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope.
1
Television be gan to look up a little in the middle thirties, after the electron tube was substituted for the mill-wheel.
2
I'd rather be a mass of electron tubes than a thing like a centipede-oh yes, I've seen that cartoon in yesterday's Chicago Tribune!