Origins
The word 'guitar' is a remarkable example of a term that crossed multiple civilizations, languages, and continents before arriving in English. Its ultimate origin is the ancient Greek 'kithára,' the name of a large, box-shaped lyre that was the professional musician's instrument of choice in classical Greece — distinct from the simpler 'lýra' played by amateurs.
The Greek kithara was a sophisticated instrument with a wooden soundbox, two rising arms, and a crossbar from which strings were stretched to the body. It was played with a plectrum and associated with the god Apollo and with serious, virtuosic performance. The Latin form 'cithara' preserved the Greek name and instrument through the Roman period.
With the Islamic conquests of the seventh and eighth centuries, the Greek-Latin word entered Arabic as 'qīṭāra.' Arab musicians in the medieval period developed their own tradition of plucked string instruments, most notably the 'ūd (the ancestor of the European lute), but the term 'qīṭāra' persisted for certain instrument types. When the Moors conquered most of the Iberian Peninsula in 711 CE, they brought both the instrument and its name. In medieval Spain, 'qīṭāra' became 'guitarra,' and the instrument evolved into a form increasingly distinct from the old lyre — gaining a waisted body, a neck with frets, and eventually the flat back that distinguished it from the rounded lute.
Spelling and Pronunciation
Spanish 'guitarra' entered English in the early seventeenth century, first attested around 1621. The spelling 'guitar' reflects English phonetic adaptation of the Spanish pronunciation. For much of the seventeenth and eighteenth centuries, the guitar was considered a light, informal instrument compared to the more prestigious lute and harpsichord. Its rise to dominance in Western popular music would not come until the twentieth century.
What makes the etymological story particularly fascinating is that the same Greek root 'kithára' produced three separate English words through different transmission routes. 'Guitar' came through Arabic and Spanish, as described above. 'Zither' came through a different path: Latin 'cithara' was borrowed into Old High German as 'zitara,' which evolved into modern German 'Zither,' borrowed into English in the nineteenth century. And 'sitar' — though the connection is debated — likely traces through Persian 'sitār' (literally 'three-stringed,' from 'si' meaning 'three' and 'tār' meaning 'string'), which some etymologists connect to the same Greek source, while others consider 'sitār' a purely Persian formation that merely resembles the Greek word by coincidence.
The Persian connection to Greek 'kithára' is one of the more contested questions in musical etymology. Some scholars argue that 'kithára' itself was borrowed into Greek from an Old Persian or Central Asian source, making the Persian word the ultimate origin rather than a derivative. Others maintain that the Greek word is native and the resemblance to Persian 'sitār' is superficial. The question remains unresolved.
Latin Roots
The guitar's physical form has changed dramatically since antiquity. The Greek kithara bore little resemblance to a modern guitar — it had no neck, no frets, and was essentially a lyre. The transformation from lyre to guitar occurred gradually across centuries of Arab and Iberian instrument-making. The four-course guitar of the Renaissance gave way to the five-course baroque guitar, which in turn yielded to the six-string classical guitar standardized by Antonio de Torres in the mid-nineteenth century. The steel-string acoustic guitar and the electric guitar of the twentieth century represent further evolutions.
Through all these physical transformations, the word has remained recognizable. From Greek 'kithára' to Arabic 'qīṭāra' to Spanish 'guitarra' to English 'guitar,' the core consonant skeleton — k/g-t-r — has survived some three thousand years of transmission across languages and civilizations.