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. Divisions of the Heart. The septum, a thick muscular wall, divides the heart into right and left halves. A muscular viscus, which is the primary organ of the blood's motion in an animal body, situated in the thorax. See more. HEART, n. L. cor, cordis, and allied to Eng.core, or named from motion, pulsation. 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). People also... | Meaning, pronunciation, translations and examples Heart attack definition is - an acute episode of coronary heart disease marked by the death or damage of heart muscle due to insufficient blood supply to the heart usually as a result of a coronary artery becoming blocked by a blood clot formed in response to a ruptured or torn fatty arterial deposit —called also myocardial infarction. KJV Dictionary Definition: heart heart. How to use heartfelt in a sentence. Heartfelt definition is - deeply felt : earnest. To have one's heart in … In reference to the conventional heart-shape in illustration, late 15c. 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. Define by heart. Synonym Discussion of heartfelt. Can you hear my heart beating? heart [hahrt] the hollow muscular organ lying slightly to the left of the midline of the chest. How to use heart attack in a sentence. The heart serves as a pump controlling the blood flow in two circuits, the pulmonary and the systemic. n. 1. by heart synonyms, by heart pronunciation, by heart translation, English dictionary definition of by heart. The card game hearts is so called from 1886. Heart definition: Your heart is the organ in your chest that pumps the blood around your body. Heart: The muscle that pumps blood received from veins into arteries throughout the body. Anatomy a. Heart disease definition, any condition of the heart that impairs its functioning. Heart-wrenching definition, causing or involving great sadness or distress; heartbreaking: The accounts of their persecution are heart-wrenching. Meaning "inner part of anything" is from early 14c. 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 attack attested from 1875; heart disease is from 1864. See also circulatory system, and see Plates. ; heart-shaped is from 1744. Her cheeks were hot and her heart was pounding. 3 people chose this as the best definition of heart: The definition of heart i... See the dictionary meaning, pronunciation, and sentence examples. 1. See more. , by heart pronunciation, by heart pronunciation, by heart synonyms by. Heart was pounding in an animal body, situated in the thorax synonyms, by heart translation English. Pumps the blood 's motion in an animal body, situated in the thorax hearts is called! Her cheeks were hot and her heart was pounding the organ in your chest that pumps blood from. Heart-Wrenching definition, causing or involving great sadness or distress ; heartbreaking: the muscle pumps... 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