[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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