American Heritage® Dictionary of the English Language, Fourth Edition
- n. A spectrum produced by a luminous gas or vapor and appearing as distinct lines characteristic of the various elements constituting the gas.
- n. physics A spectrum, typically produced by a luminous gas, that consists of separate lines typical of particular elements
- n. a spectrum in which energy is concentrated at particular wavelengths; produced by excited atoms and ions as they fall back to a lower energy level
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