In Catholicism, a cardinal is a prince of the Church; cardinals are appointed by the Pope and collectively elect the next Pope if they are under the age of eighty at the time of the election. See Cardinal (Catholicism).
In biology, a cardinal is the songbird Cardinalis cardinalis. They are red, similar to the dress of cardinals in the catholic church, hence the name. Cardinals belong to the finch family. (Pictured at right)
Cardinal is a bright redcolor like the color of the robe of a cardinal.