from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The electromagnetic spectrum, broken by a specific pattern of dark lines or bands, observed when radiation traverses a particular absorbing medium and through a spectroscope. The absorption pattern of an element is unique and can be used to identify the substance of the medium.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun physics The characteristic pattern of dark lines or bands that occurs when
electromagnetic radiationis passed through an absorbingmedium into a spectroscope.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun the spectrum of electromagnetic radiation that has passed through a medium that absorbed radiation of certain wavelengths
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