spectroheliograph Hear it!

spectroheliograph definition

☆ spectro·he·lio·graph (-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)

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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