Heart disease definition, any condition of the heart that impairs its functioning. 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. See also circulatory system, and see Plates. Her cheeks were hot and her heart was pounding. To have one's heart in … Divisions of the Heart. Heartfelt definition is - deeply felt : earnest. ; heart-shaped is from 1744. In reference to the conventional heart-shape in illustration, late 15c. Heart attack attested from 1875; heart disease is from 1864. How to use heart attack in a sentence. Anatomy a. See more. The heart serves as a pump controlling the blood flow in two circuits, the pulmonary and the systemic. Heart definition: Your heart is the organ in your chest that pumps the blood around your body. 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. The card game hearts is so called from 1886. Heart-wrenching definition, causing or involving great sadness or distress; heartbreaking: The accounts of their persecution are heart-wrenching. Heart: The muscle that pumps blood received from veins into arteries throughout the body. Define by heart. 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). Synonym Discussion of heartfelt. People also... | Meaning, pronunciation, translations and examples Meaning "inner part of anything" is from early 14c. How to use heartfelt in a sentence. KJV Dictionary Definition: heart heart. See more. Can you hear my heart beating? by heart synonyms, by heart pronunciation, by heart translation, English dictionary definition of by 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. 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. 1. n. 1. heart [hahrt] the hollow muscular organ lying slightly to the left of the midline of the chest. 3 people chose this as the best definition of heart: The definition of heart i... See the dictionary meaning, pronunciation, and sentence examples. HEART, n. 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