heart

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noun

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.

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.

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

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.

capacity for sympathy; feeling; affection: His heart moved him to help the needy.

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

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

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

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

10.

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

11.

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

12.

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

13.

a card of the suit bearing such figures.

14.

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.

15.

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

16.

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

17.

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

Relevant Questions

Where Is The Heart?

How Does the Heart Work?

What Is A Heart?

Where The Heart Is?

verb (used with object)

18.

Archaic.

to fix in the heart.

to encourage.

19.

Informal. to like or enjoy very much; love: I heart Chicago. Origin:
from the use of the stylized heart symbol to represent love.

00:10

Heart is always a great word to know.

So is creatinine. Does it mean:

soft insoluble mass formed when blood or lymph gels

a crystalline end product of creatine metabolism, C4H7N3O, occurring in urine, muscle, and blood.

LEARN MORE UNUSUAL WORDS WITH WORD DYNAMO...

Idioms

20.

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

21.

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

22.

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.

23.

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

24.

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!

25.

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

26.

eat one's heart out, to have sorrow or longing dominate one's emotions; grieve inconsolably: The children are eating their hearts out over their lost dog.

27.

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

28.

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

29.

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

30.

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.

31.

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.

32.

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

33.

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.

34.

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

35.

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

36.

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.

37.

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.

38.

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.

39.

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.

40.

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.

41.

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.

42.

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.

43.

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!

44.

with all one's heart,

with earnestness or zeal.

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

Origin:
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-)

Can be confused: hart, heart.

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Link To heart

Collins

World English Dictionary

heart (hɑːt)

—n
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 ventricleRelated: cardiac
2.	the corresponding organ or part in invertebrates
3.	this organ considered as the seat of life and emotions, esp love
4.	emotional mood or disposition: a happy heart; a change of heart
5.	tenderness or pity: you have no heart
6.	courage or spirit; bravery
7.	the inmost or most central part of a thing: the heart of the city
8.	the most important or vital part: the heart of the matter
9.	(of vegetables such as cabbage) the inner compact part
10.	the core of a tree
11.	the part nearest the heart of a person; breast: she held him to her heart
12.	a dearly loved person: usually used as a term of address: dearest heart
13.	a conventionalized representation of the heart, having two rounded lobes at the top meeting in a point at the bottom
14.	a. a red heart-shaped symbol on a playing card
	b. a card with one or more of these symbols or (when pl.) the suit of cards so marked
15.	a fertile condition in land, conducive to vigorous growth in crops or herbage (esp in the phrase in good heart)
16.	after one's own heart appealing to one's own disposition, taste, or tendencies
17.	at heart in reality or fundamentally
18.	break one's heart, break someone's heart to grieve or cause to grieve very deeply, esp through love
19.	by heart by committing to memory
20.	cross my heart!, cross my heart and hope to die! I promise!
21.	eat one's heart out to brood or pine with grief or longing
22.	from one's heart, from the bottom of one's heart very sincerely or deeply
23.	have a heart! be kind or merciful
24.	(usually used with a negative) have one's heart in it to have enthusiasm for something
25.	have one's heart in one's boots to be depressed or down-hearted
26.	have one's heart in one's mouth, have one's heart in one's throat to be full of apprehension, excitement, or fear
27.	have one's heart in the right place
	a. to be kind, thoughtful, or generous
	b. to mean well
28.	(usually used with a negative) have the heart to have the necessary will, callousness, etc (to do something): I didn't have the heart to tell him
29.	heart and soul absolutely; completely
30.	heart of hearts the depths of one's conscience or emotions
31.	heart of oak a brave person
32.	in one's heart secretly; fundamentally
33.	lose heart to become despondent or disillusioned (over something)
34.	lose one's heart to to fall in love with
35.	near to one's heart, close to one's heart cherished or important
36.	set one's heart on to have as one's ambition to obtain; covet
37.	take heart to become encouraged
38.	take to heart to take seriously or be upset about
39.	to one's heart's content as much as one wishes
40.	wear one's heart on one's sleeve to show one's feelings openly
41.	with all one's heart, with one's whole heart very willingly

—vb
42.	(intr) (of vegetables) to form a heart
43.	an archaic word for hearten

Related: cardiac

[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 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline

Word Origin & History

heart

O.E. heorte, from P.Gmc. *khertan- (cf. O.S. herta, O.N. hjarta, Du. hart, O.H.G. herza, Ger. Herz, Goth. hairto), from PIE *kerd- "heart" (cf. Gk. kardia, L. cor, O.Ir. cride, Welsh craidd, Hittite kir, Lith. irdis, Rus. serdce "heart," Breton kreiz "middle," O.C.S. sreda "middle"). Spelling with -ea-

is c.1500, by analogy of pronunciation with stream, heat, etc., but remained when pronunciation shifted. Most of the figurative senses were present in O.E., including "intellect, memory," now only in by heart. Hearty is late 14c.; heart-rending is from 1680s. Heartburn is mid-13c. Heart-strings (late 15c.) was originally literal, in old anatomy theory "the tendons and nerves that brace the heart." Heartland first recorded 1904 in geo-political writings of H.J. MacKinder.

Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage

Medical Dictionary

heart (härt)
n.

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.
A similarly functioning structure in invertebrates.

American Heritage

Science Dictionary

heart

(härt) Pronunciation Key

(click for larger image in new window)

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.
A similar but simpler organ in invertebrate animals.

American Heritage

Cultural Dictionary

heart definition

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.

Slang Dictionary

heart definition

tv.
to love someone or something. (Teens.) : She's hearting him more every day.

Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw Hill.
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Easton

Bible Dictionary

Heart definition

According to the Bible, the heart is the centre not only of spiritual activity, but of all the operations of human life. "Heart" and "soul" are often used interchangeably (Deut. 6:5; 26:16; comp. Matt. 22:37; Mark 12:30, 33), but this is not generally the case. The heart is the "home of the personal life," and hence a man is designated, according to his heart, wise (1 Kings 3:12, etc.), pure (Ps. 24:4; Matt. 5:8, etc.), upright and righteous (Gen. 20:5, 6; Ps. 11:2; 78:72), pious and good (Luke 8:15), etc. In these and such passages the word "soul" could not be substituted for "heart." The heart is also the seat of the conscience (Rom. 2:15). It is naturally wicked (Gen. 8:21), and hence it contaminates the whole life and character (Matt. 12:34; 15:18; comp. Eccl. 8:11; Ps. 73:7). Hence the heart must be changed, regenerated (Ezek. 36:26; 11:19; Ps. 51:10-14), before a man can willingly obey God. The process of salvation begins in the heart by the believing reception of the testimony of God, while the rejection of that testimony hardens the heart (Ps. 95:8; Prov. 28:14; 2 Chr. 36:13). "Hardness of heart evidences itself by light views of sin; partial acknowledgment and confession of it; pride and conceit; ingratitude; unconcern about the word and ordinances of God; inattention to divine providences; stifling convictions of conscience; shunning reproof; presumption, and general ignorance of divine things."

Easton's 1897 Bible Dictionary
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American Heritage

Idioms & Phrases

heart

In addition to the idioms beginning with 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.