variants:
or less commonly coronograph
plural coronagraphs also coronographs
Definition of coronagraph
: a telescope for observation of a star's corona
The American spacecraft was to carry the solar coronagraph, the only instrument on the mission capable of imaging the sun's polar regions …— M. Mitchell Waldrop Using an instrument called a coronagraph, the astronomers can block a star's light, to catch the dim glow of dark matter that may surround it.— Jonathan Weiner
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Merriam-Webster unabridged
Share coronagraph
Time Traveler for coronagraph
The first known use of coronagraph was in 1884
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