Definition of "Corona" :

noun: a long cigar with blunt ends

noun: (anatomy) any structure that resembles a crown in shape

noun: the outermost region of the sun's atmosphere; visible as a white halo during a solar eclipse

noun: one or more circles of light seen around a luminous object

noun: an electrical discharge accompanied by ionization of surrounding atmosphere

noun: (botany) the trumpet-shaped or cup-shaped outgrowth of the corolla of a daffodil or narcissus flower