Entry from US English dictionary
More definitions of CoronaDefinition of Corona in:
- The US English dictionary
noun (plural coronae /-niː/)
- 1 Astronomy 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 disc of the moon.More example sentences
- With the face of the Sun blocked by the Moon during a solar eclipse, the corona shines with the brightness of a full Moon.
- 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.
- 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.
- 1.1 (also corona discharge) Physics The glow around a conductor at high potential.More example sentences
- 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 ion mobility cell is doped with ions produced by a corona discharge ionisation source.
- 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.
- 1.2A small circle of light seen round the sun or moon, due to diffraction by water droplets.More example sentences
- 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 circle around the sun or moon that is smaller than a halo with a 22-degree radius, is probably a corona.
- 2 Anatomy A crown or crown-like structure.More example sentences
- 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.
- 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.
- 3 Botany The cup-shaped or trumpet-shaped outgrowth at the centre of a daffodil or narcissus flower.More example sentences
- 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.
- 4A circular chandelier in a church.More example sentences
- 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.
mid 16th century (in sense 5): from Latin, 'wreath, crown'.
- A long, straight-sided cigar.More example sentences
- Eventually all the beautiful people were puffing robustos and coronas while schmoozing, partying and sauntering among the paparazzi.
- 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.
late 19th century: from Spanish La Corona, literally 'the crown', originally a proprietary name.