Spectroheliogram
Pronunciation : Spec`tro*he"li*o*gram`
Part of Speech : n.
Definition : Defn: A photograph of the sun made by monochromatic light, usually of the calcium line (k), and showing the sun's facul? and prominences.
[Spectrum + heloi- + -gram.] (Astrophysics)
Source : Webster's Unabridged Dictionary, 1913