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aureole an encircling region of light, esp. in artistic representations of a god or holy figure, or around an astronomical object such as the moon; halo; corona.
Boötes a spring constellation in the northern sky, located between Corona Borealis and Virgo and containing the bright, orange star Arcturus; Herdsman.
chromosphere a layer of gas, mostly hydrogen, that surrounds a star, esp. the sun, above the photosphere and below the corona.
coronagraph telescopic equipment that blocks light from a star so that the star's corona and objects close to the star can be resolved.
coronavirus a type of virus that causes a variety of diseases in humans and other animals ranging from the common cold to potentially fatal illnesses. A coronavirus is an RNA virus of the family Coronaviridae and is so-named because the outer perimeter of each round virus particle resemble a spiky crown similar in shape to the sun's corona. [1/2 definitions]
Covid-19 a serious, sometimes fatal, disease caused by a certain type of virus called a "coronavirus." This particular coronavirus broke out for the first time in 2019, and the disease spread all over the world in 2020. "Co" in Covid stands for "corona," "vi" stands for "virus," and "d" stands for "disease." The number 19 refers to the year 2019. The name "Covid-19" is oftened shortened to "Covid."