corona

(noun) the outermost region of the sun's atmosphere; visible as a white halo during a solar eclipse. Synonyms: aureole.

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

(noun) an electrical discharge accompanied by ionization of surrounding atmosphere. Synonyms: corona discharge, corposant, St. Elmo's fire, Saint Elmo's fire, Saint Elmo's light, Saint Ulmo's fire, Saint Ulmo's light, electric glow.

(noun) one or more circles of light seen around a luminous object.

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

(noun) a long cigar with blunt ends.