HEART, n. L. cor, cordis, and allied to Eng.core, or named from motion, pulsation. The card game hearts is so called from 1886. 3 people chose this as the best definition of heart: The definition of heart i... See the dictionary meaning, pronunciation, and sentence examples. In reference to the conventional heart-shape in illustration, late 15c. Heartfelt definition is - deeply felt : earnest. Heart disease definition is - an abnormal condition of the heart or of the heart and circulation (such as coronary heart disease, arrhythmia, or heart-valve defect). Anatomy a. The heart is positioned in the chest behind the sternum (breastbone); in front of the trachea, esophagus, and aorta; and above the diaphragm.A normal heart is about the size of a closed fist and weighs about 298 grams or 10.5 ounces. Define by heart. A muscular viscus, which is the primary organ of the blood's motion in an animal body, situated in the thorax. Meaning "inner part of anything" is from early 14c. See also circulatory system, and see Plates. Heart definition: Your heart is the organ in your chest that pumps the blood around your body. n. 1. Divisions of the Heart. Heart disease definition, any condition of the heart that impairs its functioning. How to use heart attack in a sentence. Heart-wrenching definition, causing or involving great sadness or distress; heartbreaking: The accounts of their persecution are heart-wrenching. Her cheeks were hot and her heart was pounding. heart [hahrt] the hollow muscular organ lying slightly to the left of the midline of the chest. The septum, a thick muscular wall, divides the heart into right and left halves. by heart synonyms, by heart pronunciation, by heart translation, English dictionary definition of by heart. Heart attack attested from 1875; heart disease is from 1864. Synonym Discussion of heartfelt. How to use heartfelt in a sentence. Heart Attack (myocardial infarction): Permanent damage to the heart muscle caused by a lack of blood supply to the heart for an extended time period due to a blockage in a coronary artery. Heart: The muscle that pumps blood received from veins into arteries throughout the body. To have one's heart in … 1. See more. See more. From Longman Dictionary of Contemporary English Related topics: Biology, Shapes, patterns, Plants, Food, Human heart heart 1 / hɑːt $ hɑːrt / S1 W1 noun 1 body organ [countable] HB BODY the organ in your chest which pumps blood through your body Regular exercise is good for the heart. The heart serves as a pump controlling the blood flow in two circuits, the pulmonary and the systemic. ; heart-shaped is from 1744. Can you hear my heart beating? KJV Dictionary Definition: heart heart. 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