1. The outermost region of the sun's atmosphere; visible as a white halo during a solar eclipse
   "The corona became visible as the moon fully obscured the sun";
   - aureole, aureola
    
2. One or more circles of light seen around a luminous object
   "A corona was visible around the moon on the misty night"
    
3. (anatomy) any structure that resembles a crown in shape
   "The corona of the tooth was damaged by decay"
    
4. (botany) the trumpet-shaped or cup-shaped outgrowth of the corolla of a daffodil or narcissus flower
   "The daffodil's corona was a vibrant yellow"
    
5. An electrical discharge accompanied by ionization of surrounding atmosphere
   "Sailors reported seeing corona discharge on the ship's masts";
   - corona discharge, corposant [archaic], St. Elmo's fire, Saint Elmo's fire, Saint Elmo's light, electric glow
    
6. A long cigar with blunt ends
   "He celebrated his promotion with an expensive corona cigar"
    
7. [informal] A viral disease caused by SARS-CoV-2 that caused a global pandemic in 2020
   "Many businesses closed during the corona lockdowns";
   - COVID-19, coronavirus disease 2019, 2019-nCoV acute respiratory disease [archaic], novel coronavirus pneumonia, coronavirus [informal], Covid, Covid-19, rona [informal]

Derived forms: coronas, coronae

See also: 2019-nCov [archaic], SARS coronavirus 2, SARS-CoV-2

Type of: anatomical structure, arc, bodily structure, body structure, cigar, complex body part, coronavirus disease, discharge, electric arc, electric discharge, glow, light, plant part, plant structure, radiance, respiratory disease, respiratory disorder, respiratory illness, spark, structure, visible light, visible radiation

Part of: corolla, nimbus, nimbus cloud, rain cloud

Encyclopedia: Corona, New Mexico