spectroheliograph

[spek-troh-hee-lee-uh-graf, -grahf]
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noun

an apparatus for making photographs of the sun with a monochromatic light to show the details of the sun's surface and surroundings as they would appear if the sun emitted only that light.

Origin of spectroheliograph

First recorded in 1890–95; spectro- + heliograph
Related formsspec·tro·he·li·o·graph·ic [spek-troh-hee-lee-uh-graf-ik] /ˌspɛk troʊˌhi li əˈgræf ɪk/, adjective
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British Dictionary definitions for spectroheliograph

spectroheliograph

noun

an instrument used to obtain an image of the sun in light of a particular wavelength, such as calcium or hydrogen, to show the distribution of the element over the surface and in the solar atmosphere. The image obtained is a spectroheliogram
Derived Formsspectroheliographic, adjective

Word Origin for spectroheliograph

C19: from spectro- + helio- + -graph
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012