spec ‧ tro ‧ scope /ˈspektrəskəʊp $ -skoʊp/ BrE AmE noun [countable]
[ Date: 1800-1900 ; Language: Latin ; Origin: spectrum ( ⇨ ↑ spectrum ) + English -scope (as in microscope ) ]
an instrument used for forming and looking at spectra
—spectroscopy /spekˈtrɒskəpi $ -ˈtrɑː-/ noun [uncountable]
—spectroscopic /ˌspektrəˈskɒpɪk◂ $ -ˈskɑː-/ adjective