Dictionary:

corona

  (kə-rō'nə)

1. Astronomy.
   1. A faintly colored luminous ring appearing to surround a celestial body visible through a haze or thin cloud, especially such a ring around the moon or sun, caused by diffraction of light from suspended matter in the intervening medium. Also called aureole.
   2. The luminous irregular envelope of highly ionized gas outside the chromosphere of the sun.
2. Architecture. The projecting top part of a cornice.
3. A cigar with a long tapering body and blunt ends.
4. Anatomy. The crownlike upper portion of a bodily part or structure, such as the top of the head.
5. Botany. A crown-shaped, funnel-shaped, or trumpet-shaped outgrowth or appendage of the perianth of certain flowers, such as the daffodil or the spider lily. Also called crown.
6. Electricity. A faint glow enveloping the high-field electrode in a corona discharge, often accompanied by streamers directed toward the low-field electrode.

[Latin corōna. See crown.]

A set of rings surrounding a luminous body, such as the sun or moon. It is the result of diffraction by water droplets.

(click to enlarge)
Total solar eclipse. The delicately structured glow of the solar corona — or solar … (credit: Copyright AURA Inc./National Optical Astronomy Observatories/National Science Foundation)

Outermost region of the Sun's (or any star's) atmosphere, consisting of plasma. The Sun's corona has a temperature of about 3.6 million °F (2 million °C) and a very low density. Extending more than 8 million mi (13 million km) from the photosphere, it has no definite boundaries, continually varying in size and shape as it is affected by the Sun's magnetic field. The solar wind is formed by expansion of coronal gases. Only about half as bright as the full moon, the corona is overwhelmed by the brilliance of the solar surface and normally not visible to the unaided eye, but a total eclipse permits naked-eye observations.

For more information on corona, visit Britannica.com.

Pl. coronae [L.] a crown; a crownlike eminence or encircling structure.

• glans c. — the prominent, denticulated margin of the glans penis in the stallion.
• c. radiata — 1. the radiating crown of projection fibers passing from the internal capsule to every part of the cerebral cortex.
— 2. an investing layer of radially elongated follicle cells surrounding the zona pellucida of the ovum.

A crownlike structure on some corollas, as in daffodils and the milkweed family (Asclepiadaceae).

Dansk (Danish)
n. - korona, rund lysekrone, tandkrone, bikrone, karniskrans

Nederlands (Dutch)
corona, kroon(luchter)

Français (French)
n. - (Astron, Anat, Archit, Bot) couronne, (Phys) effet couronne, corona (cigare)

Deutsch (German)
n. - Hof, (Anat.) Korona, Krone

Ελληνική (Greek)
n. - φωτοστέφανος, άλως, (αστρον.) στέμμα ή στεφάνη (ήλιου κ.λπ.), μύλη ή κορόνα δοντιού, (ανατ.) στεφάνη, κορυφή του κρανιακού θόλου, (αρχιτ.) στεφάνη γείσου

Italiano (Italian)
corona

Português (Portuguese)
n. - coroa (f), candelabro (m) de igreja

Русский (Russian)
корона

Español (Spanish)
n. - corona

Svenska (Swedish)
n. - korona, solkorona, rund ljuskrona i kyrka, kranslist, tandkrona (anat.)

中文（简体） (Chinese (Simplified))
日冕, 冠状部位, 晕, 冠

中文（繁體） (Chinese (Traditional))
n. - 日冕, 冠狀部位, 暈, 冠

한국어 (Korean)
n. - (머리에 쓰는) 관, 코로나 현상

日本語 (Japanese)
n. - コロナ, 光冠, 円形燭架, 副冠, 冠, 光環

العربيه (Arabic)
‏(الاسم) هاله, أكليل‏

עברית (Hebrew)
n. - ‮הילה, עטרה, כותרת של שן‬

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