What the word covers now
In current English, heart is first the hollow muscle that keeps blood moving. The same noun also stands for courage, affection, private feeling, and the middle of a place, a problem, or a head of lettuce. A red two-lobed emblem, a suit of playing cards, and a verb that can mean to love all hang off that cluster. The origin of the word heart lies in native Germanic vocabulary, not in a later Romance loan, and much of the figurative range was already in use before the Norman Conquest.
Inherited, not borrowed
English did not import this noun from French or Latin. It inherited it. Old English had heorte for the anatomical organ and, in the same period, for spirit, will, desire, courage, and the mind. First written use belongs to the Old English era, before 1150. A related verb is equally old: it meant to give someone heart, in the sense of encouraging them.
The diphthong in heorte is a regular Old English development. A front vowel broke before r plus a consonant, producing eo. Later Old English and early Middle English smoothed that diphthong. Middle English copies usually show herte or hert. The modern spelling with ea is attested around 1500, when the vowel was still long. The letters stayed after the pronunciation moved, so the written form froze a stage that speech left behind. A few other words share that ea pattern; how exactly heart acquired it is not fully settled, and some accounts treat the spelling as an analogical or northern overlay rather than a simple snapshot of one southern vowel.
Gender is messy in the early record. Germanic as a whole seems to have started from a weak neuter. Old English usually treats the noun as a weak feminine, though Northumbrian sometimes shows masculine or neuter agreement, which is more likely a late local development than a preserved Germanic neuter. Weak inflections continue into Middle English. There is no prefix or suffix a modern speaker can peel away: heart is a simple inherited stem.
The Germanic and Indo-European root
Behind Old English stand reconstructed Proto-West Germanic hertā and Proto-Germanic hertô (some older handbooks write hertan-). Those forms go back to a Proto-Indo-European word for the same organ, cited as a root kerd- or as a nominative kēr. The match with Latin cor, cordis and Greek kardia is a textbook case of Grimm’s Law: the palatal or velar stop of the parent language became h in Germanic, and d became t. English heart and Latin cor are therefore one lexical item split by sound change, not two independent coinages.
Inside Germanic the family is easy to see: Dutch hart, German Herz, Gothic hairto, Old Norse hjarta, and the later Scandinavian forms Danish hjerte and Swedish hjärta. Outside Germanic the map is wider: Irish cride, Welsh craidd (also used for a center), Lithuanian širdis, Russian serdce, Armenian sirt, Hittite kir. Several of those cousins developed a “middle” sense as well, which English later acquired on a separate timetable.
The same Indo-European base re-entered English through learned borrowing. Cardiac and the combining form cardio- come from Greek. Cordial, courage, concord, and core come through Latin and French. Those words are not children of heorte; they are later arrivals that happen to share the ancient root. In a loose sense, Greek-derived cardia and native heart are doublets: same ancestor, different route into English.
Past the Indo-European family, a deeper source is not known. Standard historical dictionaries mark that next step as uncertain. Where the trail ends, the article should end with it.
How the meanings shifted
Little of the emotional vocabulary had to be invented after Old English. Speakers already treated the organ as the home of feeling, love, will, and courage, and even of memory and intellect. The idea that the heart stored thought has mostly faded, except in knowing something by heart, recorded from the late fourteenth century. That idiom preserves the old memory sense, not a comment on the muscle.
The meaning “middle or innermost part of a thing” is later, from the early fourteenth century. The conventional emblem in pictures is later still, from the late fifteenth century; heart-shaped as an adjective is eighteenth-century, dated to 1744. Medical compounds such as heart disease (1864) and heart attack (1875) belong to the vocabulary of modern pathology. The card game hearts is named from 1886.
The verb has a long, quieter life. Old English used it for encouraging. Early modern English could use it for taking something seriously to heart. Nineteenth-century gardeners spoke of cabbages forming a heart. The casual sense “to love,” often written with a heart symbol in place of the verb, is recent. It is tied to the New York tourism campaign of 1977 that put a heart in place of love; print evidence for the verb itself is usually placed in the 1990s. Sources differ on the first secure verbal attestation, but they agree that the advertising icon came first.
English once also used bowels for pity, following older biblical translation practice. Later Bible editions often substituted heart for that rendering. The swap is a reminder that English, like Greek and Hebrew, has moved the imagined seat of tenderness from one organ-word to another rather than inventing a new abstract noun.
A cousin in Latin and a spelling that stuck
The pairing with Latin cor is the fact worth keeping. Once Grimm’s Law is in view, heart is not an isolated English shape but the Germanic form of a word that still surfaces in cordial, courage, and cardiac. The ea in the modern spelling is a fossil of a long vowel from around 1500 that later speech no longer matches, leaving a written form more conservative than the spoken one.