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from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A telescope or an attachment for a telescope equipped with a disk that blacks out most of the sun, used to photograph the sun's corona.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A telescope that has an attachment which blocks out the direct light from the sun or other star, allowing examination of the corona and the detection of exoplanets


Sorry, no etymologies found.



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  • A coronagraph is a telescopic attachment designed specifically to block out the harsh, direct light from a star, so that nearby objects can be resolved without burning out the telescope's optics.

    November 14, 2008