or co·ro·no·graph

[ kuh-roh-nuh-graf, -grahf ]
/ kəˈroʊ nəˌgræf, -ˌgrɑf /

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.

Origin of coronagraph

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

Related forms

co·ro·na·graph·ic [kuh-roh-nuh-graf-ik] /kəˌroʊ nəˈgræf ɪk/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for coronagraph



/ (kəˈrəʊnəˌɡrɑːf, -ˌɡræf) /


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