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Meaning of coronagraph

co•ro•na•graph

Pronunciation: (ku-rō'nu-graf", -gräf"), [key]
— n. Astron.
  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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.