from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A spectrum produced by a luminous gas or vapor and appearing as distinct lines characteristic of the various elements constituting the gas.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A spectrum, typically produced by a luminous gas, that consists of separate lines typical of particular elements
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- 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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