from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The electromagnetic spectrum, broken by a specific pattern of dark lines or bands, observed when radiation traverses a particular absorbing medium. The absorption pattern is unique and can be used to identify the material.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The characteristic pattern of dark lines or bands that occurs when electromagnetic radiation is passed through an absorbing medium into a spectroscope.
from the GNU version of the Collaborative International Dictionary of English
- n. the spectrum of light which has passed through a medium capable of absorbing a portion of the rays. It is characterized by dark spaces, bands, or lines.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the spectrum of electromagnetic radiation that has passed through a medium that absorbed radiation of certain wavelengths
Sorry, no etymologies found.