from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun An early
electronic deviceincorporating electronsfrom a glowing cathodeinside an evacuated glass tube; functioned as a switch, amplifieretc.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope
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