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Noun(1) the outermost region of the sun's atmosphere; visible as a white halo during a solar eclipse(2) (botany(3) an electrical discharge accompanied by ionization of surrounding atmosphere(4) one or more circles of light seen around a luminous object(5) (anatomy(6) a long cigar with blunt ends(7) the outermost region of the sun's atmosphere(8) visible as a white halo during a solar eclipse(9) (botany) the trumpet shaped or cup shaped outgrowth of the corolla of a daffodil or narcissus flower(10) (anatomy) any structure that resembles a crown in shape(11) a long cigar with blunt ends [also: coronae (pl)](12) halo

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(1) With the face of the Sun blocked by the Moon during a solar eclipse, the corona shines with the brightness of a full Moon.(2) But the corona owes its origin to diffraction rather than refraction.(3) The style projects from the corona of anthers and elongates with age.(4) Contrast in spectral reflectance between the corona and corolla was evident only in Pachycarpus natalensis and Asclepias cucullata.(5) It is when the Sun is totally eclipsed that the solar corona is visible.(6) Another effect that is caused by the interaction of the sun and water droplets, is the corona .(7) Nectar is often visible at the base of the petals between the lobes of the corona .(8) 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.(9) 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.(10) 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.(11) I dropped the corona and it caught on the curtain.(12) 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.(13) In the flowers, corolla, corona and anther structure are similar, but the shape of the pollen tetrads in the two genera is different.(14) Ground-based telescopes observed a large increase in gases making up the comet's corona , including water vapour.(15) A circle around the sun or moon that is smaller than a halo with a 22-degree radius, is probably a corona .(16) He is noted for verifying Einstein's theory that light is slightly distorted in the area of the solar corona .