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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]
head cold a respiratory infection characterized by inflammation of the nasal mucous membranes, nasal congestion, and discharge of mucus; common cold.
rhinovirus any of a large group of related RNA viruses that cause respiratory diseases, esp. the common cold.