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From Longman Dictionary of Contemporary English
Related topics: Physics
spectroscopespec‧tro‧scope /ˈspektrəskəʊp $ -skoʊp/ noun [countable]  HPan instrument used for forming and looking at spectraspectroscopy /spekˈtrɒskəpi $ -ˈtrɑː-/ noun [uncountable]spectroscopic /ˌspektrəˈskɒpɪk◂ $ -ˈskɑː-/ adjective
Examples from the Corpus
spectroscopeThe bright solar surface is made up of gas at reasonably high pressure, so that in a spectroscope it yields a rainbow.Just as a telescope collects light, so a spectroscope splits it up.
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