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Adjective: spectroscopic  ,spek-tru'skó-pik
  1. Of or relating to or involving spectroscopy
    "spectroscopic analysis";
    - spectroscopical [rare]
     
  2. (astronomy) relating to or involving the analysis of electromagnetic radiation from celestial objects to determine their physical properties or redshift
    "spectroscopic measurements revealed the chemical composition, temperature, and motion of distant stars"; "spectroscopic redshift measurements are more accurate than photometric estimates for determining galaxy distances"

Encyclopedia: Spectroscopic