co·ro·na·graph also co·ro·no·graph (k -r  n-gr f )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. |
coronagraph, coronograph [kəˈrəʊnəˌgrɑːf -ˌgræf]
n
(Astronomy) an optical instrument used to simulate an eclipse of the sun so that the faint solar corona can be studied
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