Definitions

1. noun

An astronomical instrument used to block out the light from a star, allowing the light from a planet or other nearby object to be observed, typically by blocking the light with a disk or other occulting device.

“Astronomers used a coronagraph to study the faint light emitted by a distant exoplanet.”

2. verb

To block out the light from a star, typically using a coronagraph, in order to observe a planet or other nearby object.

“The team coronagraphed the star to get a better look at the surrounding planetary system.”