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