- a spectrum that consists of narrow, brightly colored, parallel lines on a dark background, emitted by a low-pressurized glowing gas
- a spectrum that consists of narrow, dark, parallel lines on a brightly colored background, produced from a hot light source that is surrounded by cooler gases that absorb and thus remove certain wavelengths
See line spectrum in American Heritage Dictionary 4
A spectrum produced by a luminous gas or vapor and appearing as distinct lines characteristic of the various elements constituting the gas.
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