[spek-tros-kuh-pee, spek-truh-skoh-pee]
the science that deals with the use of the spectroscope and with spectrum analysis.

1865–70; spectro- + -scopy

spectroscopist [spek-tros-kuh-pist] , noun
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World English Dictionary
spectroscopy (spɛkˈtrɒskəpɪ)
the science and practice of using spectrometers and spectroscopes and of analysing spectra, the methods employed depending on the radiation being examined. The techniques are widely used in chemical analysis and in studies of the properties of atoms, molecules, ions, etc

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American Heritage
Medical Dictionary

spectroscopy spec·tros·co·py (spěk-trŏs'kə-pē)
The study of spectra, especially experimental observation of optical spectra.

spec·tros'co·pist n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
spectroscopy  [%PREMIUM_LINK%]     (spěk-trŏs'kə-pē)  Pronunciation Key 
The analysis of spectra, especially light or mass spectra, to determine properties of their source. ◇ In light or optical spectroscopy, the spectrum of a light source is analyzed through a spectroscope to determine atomic composition of a substance. In astronomy, phenomena such as red shift can also be analyzed. ◇ In mass spectroscopy, a spectroscope is used to determine the composition of ions or charged molecules in a sample. Spectroscopy is also called spectrography. See also atomic spectrum, spectroscope.

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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
spectroscopy [(spek-tros-kuh-pee)]

The branch of science devoted to discovering the chemical composition of materials by looking at the light (and other kinds of electromagnetic radiation) they emit. Scientists use spectroscopy to determine the nature of distant stars and galaxies as well as to identify and monitor the production of products in factories.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
The different ices are revealed by spectroscopy, the study of different light
Aerial surveys use spectroscopy, a sampling of color to that lets us make
  generalizations about tree species.
Once a planet's light has been captured, scientists can use spectroscopy to
  measure the gases that make up its atmosphere.
Using a couple of spectroscopy techniques, the team sought to learn how the
  charged mosaics emerged.
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