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coronagraph

or coronograph

[kuh-roh-nuh-graf, -grahf] /kəˈroʊ nəˌgræf, -ˌgrɑf/
noun, Astronomy.
1.
an instrument for observing and photographing the sun's corona, consisting of a telescope fitted with lenses, filters, and diaphragms that simulate an eclipse.
Origin of coronagraph
1885-1890
1885-90; earlier coronograph. See corona, -graph
Related forms
coronagraphic
[kuh-roh-nuh-graf-ik] /kəˌroʊ nəˈgræf ɪk/ (Show IPA), adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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British Dictionary definitions for coronagraph

coronagraph

/kəˈrəʊnəˌɡrɑːf; -ˌɡræf/
noun
1.
an optical instrument used to simulate an eclipse of the sun so that the faint solar corona can be studied
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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