corona

A corona is a glowing circle of light around an object. You can see the Sun's corona during a total solar eclipse.

The word corona refers in a general sense to a circle or ring of light. In scientific terms, a corona is the very outer part of the Sun's gaseous atmosphere. If you want to see the corona of the Sun, you'll have to use a special viewing device during the next solar eclipse (don't look directly at the Sun — it's not safe!). In the 17th century, corona referred to a circular crown, from the Latin word for "crown or garland."

Definitions of corona
  1. noun
    one or more circles of light seen around a luminous object
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    type of:
    light, visible light, visible radiation
    (physics) electromagnetic radiation that can produce a visual sensation
  2. noun
    the outermost region of the sun's atmosphere; visible as a white halo during a solar eclipse
    synonyms: aureole
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    type of:
    glow, glowing, radiance
    the amount of electromagnetic radiation leaving or arriving at a point on a surface
  3. noun
    an electrical discharge accompanied by ionization of surrounding atmosphere
  4. noun
    (anatomy) any structure that resembles a crown in shape
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    type of:
    anatomical structure, bodily structure, body structure, complex body part, structure
    a particular complex anatomical part of a living thing
  5. noun
    (botany) the trumpet-shaped or cup-shaped outgrowth of the corolla of a daffodil or narcissus flower
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    type of:
    plant part, plant structure
    any part of a plant or fungus
  6. noun
    a long cigar with blunt ends
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    type of:
    cigar
    a roll of tobacco for smoking
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