[ hahrt ]
See synonyms for heart on Thesaurus.com
  1. Anatomy. a hollow, pumplike organ of blood circulation, composed mainly of rhythmically contractile smooth muscle, located in the chest between the lungs and slightly to the left and consisting of four chambers: a right atrium that receives blood returning from the body via the superior and inferior vena cavae, a right ventricle that pumps the blood through the pulmonary artery to the lungs for oxygenation, a left atrium that receives the oxygenated blood via the pulmonary veins and passes it through the mitral valve, and a left ventricle that pumps the oxygenated blood, via the aorta, throughout the body.

  2. Zoology.

    • the homologous structure in other vertebrates, consisting of four chambers in mammals and birds and three chambers in reptiles and amphibians.

    • the analogous contractile structure in invertebrate animals, as the tubular heart of the spider and earthworm.

  1. the center of the total personality, especially with reference to intuition, feeling, or emotion: In your heart you know I'm an honest man.

  2. the center of emotion, especially as contrasted to the head as the center of the intellect: His head told him not to fall in love, but his heart had the final say.

  3. capacity for sympathy; feeling; affection: His heart moved him to help people in need.

  4. spirit, courage, or enthusiasm: His heart sank when he walked into the room and saw their gloomy faces.

  5. the innermost or central part of anything: Notre Dame stands in the very heart of Paris.

  6. the vital or essential part; core: the heart of the matter.

  7. the breast or bosom: to clasp a person to one's heart.

  8. a person (used especially in expressions of praise or affection): dear heart.

  9. a conventional shape with rounded sides meeting in a point at the bottom and curving inward to a cusp at the top.

  10. a red figure or pip of this shape on a playing card.

  11. a card of the suit bearing such figures.

  12. hearts,

    • (used with a singular or plural verb) the suit so marked: Hearts is trump. Hearts are trump.

    • (used with a singular verb) a game in which the players try to avoid taking tricks containing this suit.

  13. Botany. the core of a tree; the solid central part without sap or albumen.

  14. good condition for production, growth, etc., as of land or crops.

  15. Also called core. Ropemaking. a strand running through the center of a rope, the other strands being laid around it.

verb (used with object)
  1. Archaic.

    • to fix in the heart.

    • to encourage.

  2. Informal. to like or enjoy very much; love: I heart Chicago.

Idioms about heart

  1. after one's own heart, in keeping with one's taste or preference: There's a man after my own heart!

  2. at heart, in reality; fundamentally: At heart she is a romantic.

  1. break someone's heart, to cause someone great disappointment or sorrow, as to disappoint in love: The news that their son had been arrested broke their hearts.

  2. by heart, by memory; word-for-word: They knew the song by heart.

  3. cross one's heart, to maintain the truth of one's statement; affirm one's integrity: That's exactly what they told me, I cross my heart!

  4. do someone's heart good, to give happiness or pleasure to; delight: It does my heart good to see you again.

  5. eat one's heart out, to have jealousy, longing, or sorrow dominate one's emotions (often used in the imperative and with jocular reference to a famous potential rival): My baby is a genius—Einstein, eat your heart out! He’s eating his heart out over his defeat.

  6. from the bottom of one's heart, with complete sincerity.: Also from one's heart, from the heart .

  7. have a heart, to be compassionate or merciful: Please have a heart and give her another chance.

  8. have at heart, to have as an object, aim, or desire: to have another's best interests at heart.

  9. have one's heart in one's mouth, to be very anxious or fearful: He wanted to do the courageous thing, but his heart was in his mouth.

  10. have one's heart in the right place, to be fundamentally kind, generous, or well-intentioned: The old gentleman may have a stern manner, but his heart is in the right place.

  11. heart and soul, enthusiastically; fervently; completely: They entered heart and soul into the spirit of the holiday.

  12. in one's heart of hearts, in one's private thoughts or feelings; deep within one: He knew, in his heart of hearts, that the news would be bad. : Also in one's heart .

  13. lose one's heart to, to fall in love with: He lost his heart to the prima ballerina.

  14. my heart is full. See entry at my heart is full.

  15. near / dear / close to one's heart, of great interest or concern to one: It is a cause that is very near to his heart.

  16. not have the heart, to lack the necessary courage or callousness to do something: No one had the heart to tell him he was through as an actor.

  17. pour out one's heart, to reveal one's thoughts or private feelings:She poured out her heart to me. : Also open one's heart .

  18. set one's heart against, to be unalterably opposed to: She had set her heart against selling the statue. : Also have one's heart set against .

  19. set one's heart at rest, to dismiss one's anxieties: She couldn't set her heart at rest until she knew he had returned safely.

  20. set one's heart on, to wish for intensely; determine on: She has set her heart on going to Europe after graduation. : Also have one's heart set on .

  21. take heart, to regain one's courage; become heartened: Her son's death was a great blow, but she eventually took heart, convinced that God had willed it.

  22. take / lay to heart,

    • to think seriously about; concern oneself with: He took to heart his father's advice.

    • to be deeply affected by; grieve over: She was prone to take criticism too much to heart.

  23. to one's heart's content, until one is satisfied; as much or as long as one wishes: The children played in the snow to their heart's content.

  24. wear one's heart on one's sleeve,

    • to make one's intimate feelings or personal affairs known to all: She was not the kind who would wear her heart on her sleeve.

    • to be liable to fall in love; fall in love easily: How lovely to be young and wear our hearts on our sleeves!

  25. with all one's heart,

    • with earnestness or zeal.

    • with willingness; cordially: She welcomed the visitors with all her heart.

Origin of heart

First recorded before 900; Middle English herte, Old English heorte; cognate with Dutch hart, German Herz, Old Norse hjarta, Gothic hairtō; akin to Latin cor (see cordial, courage), Greek kardía (see cardio-); def. 19 comes from the use of the stylized heart symbol to represent love

Words that may be confused with heart

Words Nearby heart

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use heart in a sentence

British Dictionary definitions for heart


/ (hɑːt) /

  1. the hollow muscular organ in vertebrates whose contractions propel the blood through the circulatory system. In mammals it consists of a right and left atrium and a right and left ventricle: Related adjective: cardiac

  2. the corresponding organ or part in invertebrates

  1. this organ considered as the seat of life and emotions, esp love

  2. emotional mood or disposition: a happy heart; a change of heart

  3. tenderness or pity: you have no heart

  4. courage or spirit; bravery

  5. the inmost or most central part of a thing: the heart of the city

  6. the most important or vital part: the heart of the matter

  7. (of vegetables such as cabbage) the inner compact part

  8. the core of a tree

  9. the part nearest the heart of a person; breast: she held him to her heart

  10. a dearly loved person: usually used as a term of address: dearest heart

  11. a conventionalized representation of the heart, having two rounded lobes at the top meeting in a point at the bottom

    • a red heart-shaped symbol on a playing card

    • a card with one or more of these symbols or (when pl.) the suit of cards so marked

  12. a fertile condition in land, conducive to vigorous growth in crops or herbage (esp in the phrase in good heart)

  13. after one's own heart appealing to one's own disposition, taste, or tendencies

  14. at heart in reality or fundamentally

  15. break one's heart or break someone's heart to grieve or cause to grieve very deeply, esp through love

  16. by heart by committing to memory

  17. cross my heart! or cross my heart and hope to die! I promise!

  18. eat one's heart out to brood or pine with grief or longing

  19. from one's heart or from the bottom of one's heart very sincerely or deeply

  20. have a heart! be kind or merciful

  21. have one's heart in it (usually used with a negative) to have enthusiasm for something

  22. have one's heart in one's boots to be depressed or down-hearted

  23. have one's heart in one's mouth or have one's heart in one's throat to be full of apprehension, excitement, or fear

  24. have one's heart in the right place

    • to be kind, thoughtful, or generous

    • to mean well

  25. have the heart (usually used with a negative) to have the necessary will, callousness, etc (to do something): I didn't have the heart to tell him

  26. heart and soul absolutely; completely

  27. heart of hearts the depths of one's conscience or emotions

  28. heart of oak a brave person

  29. in one's heart secretly; fundamentally

  30. lose heart to become despondent or disillusioned (over something)

  31. lose one's heart to to fall in love with

  32. near to one's heart or close to one's heart cherished or important

  33. set one's heart on to have as one's ambition to obtain; covet

  34. take heart to become encouraged

  35. take to heart to take seriously or be upset about

  36. to one's heart's content as much as one wishes

  37. wear one's heart on one's sleeve to show one's feelings openly

  38. with all one's heart or with one's whole heart very willingly

  1. (intr) (of vegetables) to form a heart

  2. an archaic word for hearten

Origin of heart

Old English heorte; related to Old Norse hjarta, Gothic hairtō, Old High German herza, Latin cor, Greek kardia, Old Irish cride

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for heart


[ härt ]

  1. The hollow, muscular organ that pumps blood through the body of a vertebrate animal by contracting and relaxing. In humans and other mammals, it has four chambers, consisting of two atria and two ventricles. The right side of the heart collects blood with low oxygen levels from the veins and pumps it to the lungs. The left side receives blood with high oxygen levels from the lungs and pumps it into the aorta, which carries it to the arteries of the body. The heart in other vertebrates functions similarly but often has fewer chambers.

  2. A similar but simpler organ in invertebrate animals.

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Cultural definitions for heart


The hollow muscular organ that is the center of the circulatory system. The heart pumps blood throughout the intricate system of blood vessels in the body.

The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Other Idioms and Phrases with heart


In addition to the idioms beginning with heart

  • heart and soul
  • heart goes out to, one's
  • heart in it, have one's
  • heart in one's mouth, have one's
  • heart in the right place, have one's
  • heart is set on
  • heart misses a beat, one's
  • heart not in it
  • heart of gold
  • heart of stone
  • heart of the matter
  • heart on one's sleeve
  • heart sinks, one's
  • heart stands still
  • heart to heart

also see:

  • absence makes the heart grow fonder
  • after one's own heart
  • at heart
  • break someone's heart
  • by heart
  • change of heart
  • cold hands, warm heart
  • cross my heart
  • cry one's eyes (heart) out
  • cut to the quick (heart)
  • do one (one's heart) good
  • eat one's heart out
  • find it in one's heart
  • from the bottom of one's heart
  • get to the heart of
  • give someone heart failure
  • half a heart
  • harden one's heart
  • have a heart
  • have no heart for
  • heavy heart
  • in one's heart of hearts
  • lose heart
  • lose one's heart to
  • near to one's heart
  • not have the heart to
  • open one's heart
  • pour out one's heart
  • set one's heart on
  • sick at heart
  • steal someone's heart
  • steel one's heart against
  • take heart
  • take to heart
  • to one's heart's content
  • warm heart
  • warm the cockles of one's heart
  • wear one's heart on one's sleeve
  • with all one's heart
  • young at heart

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.