Corona: A pastel halo around the moon or sun created by the diffraction of water droplets. The droplets in the cloud, such as cirrostratus, and the cloud layer itself must be almost perfectly uniform in order for this phenomena to occur. The color display sometimes appears to be iridescent.

 

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Corona: A pastel halo around the moon or sun created by the diffraction of water droplets. The droplets in the cloud, such as cirrostratus, and the cloud layer itself must be almost perfectly unifor . . . View Full Definition

Coronary Occlusion: The blocking of the coronary blood vessels.

Sovereign Coronation: Variety developed in Canada and released prior to 1978. Has synonym names Coronation and Summerland 361. Derived from a Lady Patricia x Himrod cross and popular as a Concord-like tablegrape.

Coronary Arteries: Arteries that supply the hearts muscle fibers with nutrients and oxygen.

Coronary Heart Disease (Chd): Diseases of the heart muscle and the blood vessels that supply it with oxygen, high risk factor for a heart attack.

Intracoronal: The area within the crown of a tooth.

Extracoronal: The outside of the crown of the tooth.

Coronary Circulation: Circulation of blood to the heart muscle associated with the blood carrying capacity of a specific vessel or development of collateral vessels (extra blood vessels).

Thrombosis: The formation or presence of a blood clot in a blood vessel. The vessel may be any vein or artery as, for example, in a deep vein thrombosis or a coronary (artery) thrombosis. The clot itsel . . . View Full Definition

Ice Crystals: Precipitation in the form of slowly falling, singular or unbranched ice needles, columns, or plates. They make up cirriform clouds, frost, and ice fog. Also, they produce optical phenomena s . . . View Full Definition