noun
or co·ro·no·graph kəˈrōnəˌgraf
( -s )
Etymology: coronagraph alteration of coronograph, from corona (I) + -o- + -graph
: a telescope designed to facilitate observations of the sun's corona without benefit of a total solar eclipse, usually containing a monochromatic objective lens and a series of diaphragms to eliminate scattered light, and used with a monochromatic filter matching one of the wavelength regions of the bright emission lines of the corona
• co·ro·na·graph·ic or co·ro·no·graph·ic kə|rōnə|grafik adjective