glow-lamp

glow lamp

noun Electronics.
a vacuum tube containing a gas that is ionized by the electrons, giving a visible glow.

Origin:
1880–85

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World English Dictionary
glow lamp
 
n
a small light consisting of two or more electrodes in an inert gas, such as neon, at low pressure, across which an electrical discharge occurs when the voltage applied to the electrodes exceeds the ionization potential

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