coronagraph

American  

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

Or coronograph

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.

---

coronagraph British  

/ -ˌɡræf, kəˈrəʊnəˌɡrɑːf /

noun

1. an optical instrument used to simulate an eclipse of the sun so that the faint solar corona can be studied

---

Other Word Forms

• coronagraphic adjective

Etymology

Origin of coronagraph

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

Example Sentences

Roman is scheduled to conduct a technology demonstration that will test advanced coronagraph systems.

From Science Daily • Dec. 21, 2025

India’s coronagraph, Prof Ramesh says, has a slight advantage over the coronagraph in Nasa-ESA's joint Solar and Heliospheric Observatory.

From BBC • Nov. 26, 2024

It will also carry the first operational compact coronagraph that will help detect space weather for early warnings of disruptions to power grids, communications and navigation systems.

From Los Angeles Times • May 30, 2024

The HWO’s coronagraph will need to cope with stars that are 10 billion times brighter.

From Science Magazine • Jan. 9, 2023

Similar ill success attended his and Professor Riccò's employment, on Mount Etna in July, 1894, of a specially designed coronagraph.

From A Popular History of Astronomy During the Nineteenth Century Fourth Edition by Clerke, Agnes M. (Agnes Mary)