| VED | vacuum erection device; ventricular ectopic depolarization; vital exhaustion and depression |
|---|---|
| VTVM | vacuum tube voltmeter |
| VUV | vacuum ultraviolet |
| vacuum tube | A glass tube from which the air has been removed, containing two or more electrodes, between which passes an electrical current or spark; used in the production of X-rays, or to control circuits. Previously in wide use, the vacuum tube has been supplanted by transistors in electronic circuits. (05 Mar 2000) |
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