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The rarefied gaseous envelope of the sun and other stars. The sun's corona is normally visible only during a total solar eclipse when it is seen as an irregularly shaped pearly glow surrounding the darkened disk of the moon.
- ‘It is when the Sun is totally eclipsed that the solar corona is visible.’
- ‘Like the chromosphere, the corona can only be seen by eye during a total eclipse, although there are other technical ways to observe it between times.’
- ‘With the face of the Sun blocked by the Moon during a solar eclipse, the corona shines with the brightness of a full Moon.’
- ‘For the professional astronomers, the main subject of inquiry was the solar corona.’
- ‘As the brilliant Sun is covered by the Moon, the pearly corona flashes into view, the sky darkens, and all of nature seems to come to a halt.’
- 1.1Physics The glow around a conductor at high potential.
- ‘In this process, the difficult-to-bond plastic is exposed to a corona discharge, usually in the presence of air and at atmospheric pressure.’
- ‘The hood of the truck blazed with dazzling corona discharges and St. Elmo's fire coruscated around the headlamps and other metal fixtures.’
- ‘The ion mobility cell is doped with ions produced by a corona discharge ionisation source.’
- ‘It also detects corona discharge, bearing wear, steam traps, valve noise, and some gaseous and water leaks.’
- ‘Instead of generating a lightning strike, the corona discharge, as it's called, flees objects such the masts of ships, power poles, antennas, and the wings of aircraft, causing the glow.’
- 1.2 A small circle of light seen around the sun or moon, due to diffraction by water droplets.
- ‘A circle around the sun or moon that is smaller than a halo with a 22-degree radius, is probably a corona.’
- ‘He is noted for verifying Einstein's theory that light is slightly distorted in the area of the solar corona.’
- ‘Ground-based telescopes observed a large increase in gases making up the comet's corona, including water vapour.’
- ‘Another effect that is caused by the interaction of the sun and water droplets, is the corona.’
- ‘But the corona owes its origin to diffraction rather than refraction.’
A crown or crownlike structure.
- ‘In most species, the head carries a corona of cilia that draws a vortex of water into the mouth, which the rotifer sifts for food.’
- ‘The heart muscle has its own blood supply coming from a crown or corona of blood vessels that circle the heart, sending down branches to various parts of the muscle.’
- 2.1Botany The cup-shaped or trumpet-shaped outgrowth at the center of a daffodil or narcissus flower.
- ‘In the flowers, corolla, corona and anther structure are similar, but the shape of the pollen tetrads in the two genera is different.’
- ‘The style projects from the corona of anthers and elongates with age.’
- ‘Contrast in spectral reflectance between the corona and corolla was evident only in Pachycarpus natalensis and Asclepias cucullata.’
- ‘Nectar is often visible at the base of the petals between the lobes of the corona.’
3A circular chandelier in a church.
- ‘The curious structure in the front tea room was a rectilinear framework of wood with an elaborate wrought-iron flower stand on top of it and a circular wrought iron corona above that.’
A part of a cornice having a broad vertical face.
Mid 16th century ( corona): from Latin, wreath, crown.
A long, straight-sided cigar.
- ‘For instance, a corona that is typically 5.5 x 42 means that the cigar measures 5.5 inches in length and 42/60ths of an inch in diameter.’
- ‘I dropped the corona and it caught on the curtain.’
- ‘Eventually all the beautiful people were puffing robustos and coronas while schmoozing, partying and sauntering among the paparazzi.’
Late 19th century: from Spanish La Corona, literally the crown originally a proprietary name.
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