Anatomy The chambered muscular organ in vertebrates that pumps blood received from the veins into the arteries, thereby maintaining the flow of blood through the entire circulatory system. Anatomy A similarly functioning structure in invertebrates. The area that is the approximate location of the heart in the body; the breast. The vital center and source of one's being, emotions, and sensibilities. The repository of one's deepest and sincerest feelings and beliefs: an appeal from the heart; a subject dear to her heart. The seat of the intellect or imagination: the worst atrocities the human heart could devise. Emotional constitution, basic disposition, or character: a man after my own heart. One's prevailing mood or current inclination: We were light of heart. Capacity for sympathy or generosity; compassion: a leader who seems to have no heart. Love; affection: The child won my heart. Courage; resolution; fortitude: The soldiers lost heart and retreated. The firmness of will or the callousness required to carry out an unpleasant task or responsibility: hadn't the heart to send them away without food. A person esteemed or admired as lovable, loyal, or courageous: a dear heart. The central or innermost physical part of a place or region: the heart of the financial district. See Synonyms at center. The core of a plant, fruit, or vegetable: hearts of palm. The most important or essential part: get to the heart of the matter. A conventional two-lobed representation of the heart, usually colored red or pink. Games A red, heart-shaped figure on certain playing cards. Games A playing card with this figure. Games The suit of cards represented by this figure. Games A card game in which the object is either to avoid hearts when taking tricks or to take all the hearts. Archaic To encourage; hearten. at heart In one's deepest feelings; fundamentally. by heart Learned by rote; memorized word for word. do (one's) heart good To lift one's spirits; make one happy.