co·​ro·​na·​graph | \ kə-ˈrō-nə-ˌgraf How to pronounce coronagraph (audio) \
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

Examples of coronagraph in a Sentence

Recent Examples on the Web Webb’s coronagraph will block a star’s light, revealing its orbiting planets. Ethan Siegel, Forbes, 7 June 2021 Present plans call for WFIRST to fly with a high-performance coronagraph, an instrument capable of blocking a star’s light so that faint accompanying planets can be directly imaged. Lee Billings, Scientific American, 24 Aug. 2016 The coronagraph includes a disk to block out most of the light to look at what is going on in the sun’s outer atmosphere. Kenneth Chang, New York Times, 10 Feb. 2020 New technology will enable the coronagraph to block multiple stars at the same time, needed to hunt for exoplanets in star systems that, unlike our own, have two stars or more. Umar Farooq, Science | AAAS, 4 Mar. 2020 But like other premier telescopes, DAG will also have a coronagraph, an instrument that masks bright stars to remove their glare so that dim planets orbiting them can be imaged directly. Umar Farooq, Science | AAAS, 4 Mar. 2020 And like the coronagraph, the starshade is not a fully mature technology yet. Loren Grush, The Verge, 8 Sep. 2018 As part of Breakthrough Watch, the organization is studying a small coronagraph-carrying space telescope akin to ACESat. Corey S. Powell, Scientific American, 5 Aug. 2019 To avoid being dazzled by the bright disk of Earth, the telescope would need a mask, known as a coronagraph, to block it out. Daniel Clery, Science | AAAS, 6 Aug. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'coronagraph.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of coronagraph

1884, in the meaning defined above

History and Etymology for coronagraph

corona + -graph

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Time Traveler for coronagraph

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The first known use of coronagraph was in 1884

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Last Updated

14 Jun 2021

Cite this Entry

“Coronagraph.” Dictionary, Merriam-Webster, Accessed 18 Jun. 2021.

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