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From: Webster's Revised Unabridged Dictionary (1913)

 Spec·tro·he·li·o·graph n. Astrophysics An apparatus for making spectroheliograms, consisting of a spectroscopic camera used in combination with a telescope, and provided with clockwork for moving the  sun's image across the slit. -- Spec*tro*he*li*o*graph*ic a.
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