Definitions:
the rarefied gaseous envelope of the sun and other stars. the sun's corona is normally visible only during a total solar eclipse, when it is seen as an irregularly shaped pearly glow surrounding the darkened disc of the moon.

a part of the body resembling or likened to a crown.

the cup-shaped or trumpet-shaped outgrowth at the centre of a daffodil or narcissus flower.

a circular chandelier in a church.

a part of a cornice having a broad vertical face.

infection with or disease caused by covid-19

a long, straight-sided cigar.