[kuh-roh-nuh-graf, -grahf]
noun Astronomy.
an instrument for observing and photographing the sun's corona, consisting of a telescope fitted with lenses, filters, and diaphragms that simulate an eclipse.

1885–90; earlier coronograph. See corona, -graph

coronagraphic [kuh-roh-nuh-graf-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
coronagraph or coronograph (kəˈrəʊnəˌɡrɑːf, -ˌɡræf, kəˈrəʊnəˌɡrɑːf, -ˌɡræf)
an optical instrument used to simulate an eclipse of the sun so that the faint solar corona can be studied
coronograph or coronograph

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica


telescope that blocks the light of a star inside the instrument so that objects close to the star can be observed. It was invented in 1930 by the French astronomer Bernard Lyot and was used to observe the Sun's corona and prominences.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
They're building a super adaptive optics camera with a coronagraph that blocks a star's light in order to image its planet.
Images for coronagraph
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