from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A unique pattern indicating the presence of a particular molecule, based on specialized analytic techniques such as mass- or x-ray-spectroscopy, used to identify a pollutant, drug, contaminant, or other chemical in a test sample.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. the unique combination of analytical results from a number of techniques that identifies a particular compound in a sample
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