Corona

n. halo, white or colored circle surrounding an object (such as the sun or moon)

A corona is a type of  plasma "atmosphere" of the Sun or other celestial body, extending millions of kilometres into space, most easily seen during a total solar eclipse, but also observable in a coronagraph. The high temperature of the corona gives it unusual spectral features, which led some to suggest, in the 19th century, that it contained a previously unknown element, "coronium"; however these spectral features have since been traced to highly ionized Iron (Fe(XIV)) which indicates a plasma temperature in excess of 106Kelvin.
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Corona was the name of a series of US military reconnaissance satellites operated under a CIA program with substantial assistance from the US Air Force, used for photographic surveillance of the Soviet Union, China and other areas from June 1959 until May 1972 . The project name is sometimes given as CORONA, but it is a codeword, not an acronym.
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Noun
1. the outermost region of the sun's atmosphere; visible as a white halo during a solar eclipse
(synonym) aureole
(hypernym) radiance, glow, glowing
(part-holonym) nimbus, nimbus cloud, rain cloud
2. (botany) the trumpet shaped or cup shaped outgrowth of the corolla of a daffodil or narcissus flower
(hypernym) plant part, plant structure
(part-holonym) corolla
(classification) botany, phytology
3. an electrical discharge accompanied by ionization of surrounding atmosphere
(synonym) 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
(hypernym) discharge, spark, arc, electric arc, electric discharge
4. one or more circles of light seen around a luminous object
(hypernym) light, visible light, visible radiation
5. (anatomy) any structure that resembles a crown in shape
(hypernym) structure, anatomical structure, complex body part, bodily structure, body structure
(classification) anatomy, general anatomy
6. a long cigar with blunt ends
(hypernym) cigar

n. crown, corona, wreath, circle, ring, rosary, rim; krone, unit of currency in Denmark and Norway

v. crown; appoint as king; honor; realize, fulfill, accomplish

n. crown, diadem; coronet; corona; krone, unit of currency in Denmark and Norway

v. crown, coronate; diadem; top, pinnacle; queen