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spectroheliograph

(-graf′, -gräf′)

☆

noun

an instrument acting like a filter, for photographing the sun using light from only one spectral line, usually from hydrogen (red) or calcium (violet)

See spectroheliograph in American Heritage Dictionary 4

noun

An instrument used to make spectroheliograms.

Related Forms:

specˌtro·heˌli·o·graphˈic adjective

specˌtro·heˌli·ogˈra·phy (-ŏgˈrə-fē) noun

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spectroheliograph

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