area of cardiac dullness: a triangular area of the front of the chest (determined by percussion); corresponds to the part of the heart not covered by the lungs
area: a part of an animal that has a special function or is supplied by a given artery or nerve
cat and mouse: a game for children in which the players form a circle and join hands; they raise their hands to let a player inside the circle or lower their hands to bar a second player who is chasing the first