Corona

Noun

 * 1) A crown or garland bestowed among the Romans as a reward for distinguished services.
 * : The luminous plasma atmosphere of the Sun or other star, extending millions of kilometres into space, most easily seen during a total solar eclipse,
 * : Any crown-like appendage of a plant or animal.
 * 1) (electrical): a low energy discharge caused by ionization of a gas by an electric field [quite common at conductor bends of 12kV or higher].

Thesaurus
androecium, annular muscle, annulus, anthelion, anther, antisun, areola, aura, aureole, belvedere, box of cigars, calyx, carpel, ceiling fixture, chandelier, chaplet, cheroot, chromosphere, cigar, cigar box, cigar case, cigar cutter, cigarillo, circle, circlet, circuit, circumference, circus, closed circle, colorado, corolla, corolla tube, corona lucis, coronet, countersun, crown, cycle, daystar, diadem, discus, disk, electrolier, epicalyx, eternal return, fairy ring, garland, gasolier, glory, gynoecium, halo, humidor, lasso, logical circle, loop, looplet, lunar corona, lunar halo, luster, magic circle, megasporophyll, microsporophyll, mock moon, mock sun, moon dog, nimbus, noose, orb of day, orbit, paraselene, parhelic circle, parhelion, perianth, petal, photosphere, pistil, radius, rainbow, receptacle, ring, rondelle, rope, round, roundel, saucer, solar corona, solar flare, solar halo, solar prominence, solar wind, sphincter, stamen, stigma, stinker, stogie, style, sun, sun dog, torus, trichinopoly, vicious circle, wheel, wreath