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corona (n.)

1650s, "a crown," from Latin corona "a crown, a garland," in ancient Rome especially "a crown or garland bestowed for distinguished military service" (from a suffixed form of PIE root *sker- (2) "to turn, bend").

With many extended senses in botany, anatomy, etc. As a brand of Cuban cigar, 1876. The brand of Mexican pale lager beer dates from 1925. The astronomical sense of "luminous circle observed around the sun during total eclipses" is from 1809. The two "crown" constellations, Corona Borealis and Corona Australis, both are Ptolemaic.

Corona Borealis "certainly is much more like that for which it is named than usually is the case with our sky figures," according to Richard Hinckley Allen ("Star-Names and Their Meaning," 1899), and he adds that to the Greeks it was stephanos, a wreath, and from Roman times on typically it was Ariadne's Crown. To Arab astronomers, however, it was Al Fakkah "the dish" (sometimes "the pauper's dish" or "the broken dish" — Latinized as Discus parvus confractus — as the celestial circle is incomplete), a word wrestled into European languages as Alphaca or Alphecca, and used as the name of the constellation's none-too-bright brightest star.

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Definitions of corona from WordNet

corona (n.)
the outermost region of the sun's atmosphere; visible as a white halo during a solar eclipse;
Synonyms: aureole
corona (n.)
(botany) the trumpet-shaped or cup-shaped outgrowth of the corolla of a daffodil or narcissus flower;
corona (n.)
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
corona (n.)
one or more circles of light seen around a luminous object;
corona (n.)
(anatomy) any structure that resembles a crown in shape;
corona (n.)
a long cigar with blunt ends;
From wordnet.princeton.edu