/ˈfɪŋɡər/
[noun] One of the five long, thin parts at the end of your hand, used for touching, holding, and pointing at things.
The word 'finger' is so ancient that linguists can trace it back over 6,000 years to a root meaning 'five' — one per hand.
The word 'finger' comes from Old English 'finger', which was used in exactly the same way we use it today. This makes it one of those rare, stubborn words that has barely changed its form or meaning across more than a thousand years of English history. The Old English 'finger' descended from Proto-Germanic *fingraz, a word shared by virtually all the Germanic languages — compare Old Norse 'fingr', Old High German 'fingar', and Gothic 'figgrs'. These ancient cousins all point to the same ancestral word sitting at the root of an entire family of languages.
The real surprise comes when you dig deeper into Proto-Germanic *fingraz and ask where it came from. Most etymologists connect it to the Proto-Indo-European root *penkwe, meaning simply 'five'. The logic is beautifully direct: a finger is, quite literally, one of the five. From that same root *penkwe, Latin developed the word 'quinque' (five), which gave us words like 'quintet' and 'quintuple'. Greek produced 'pente' (five), which gave us 'pentagon' and 'pentathlon'. So when you wiggle your fingers, you are, in the deepest linguistic sense, counting to five.
In Old English, the thumb was sometimes included when people counted fingers, and sometimes excluded — just as it is in everyday debate today. But the word 'finger' itself was applied to all five digits, the thumb included, in many early texts. Over time, English gradually settled on the convention of treating the thumb as a separate thing, so that 'finger' came to mean only the four non-thumb digits, or even more specifically the index, middle, ring, and little fingers. This narrowing of meaning is a common process in language, where a broad word becomes more precise as speakers feel the need to be more specific.
Each individual finger eventually acquired its own name, and those names have their own fascinating stories. The 'index finger' takes its name from the Latin 'index', meaning pointer or indicator, from 'indicare' (to point out) — Latin indicare → English 'indicate' and 'index'. The 'ring finger' was named for the tradition of wearing wedding rings on that particular digit. The 'pinky', used for the smallest finger in American and Scottish English, comes from Dutch 'pink', meaning little finger. And the 'middle finger' is simply the one in the middle — though its rude gesture has a history debated by scholars for centuries.
As a verb, 'finger' has been used in English since at least the 14th century, meaning to touch or feel something with the fingers. It also developed the meaning of identifying or pointing someone out — as in 'fingering' a suspect — which echoes that very old idea of the finger as the instrument of pointing. Musicians speak of 'fingering' to describe the technique of placing fingers on an instrument, a usage that dates to the 16th century. The word has woven itself into dozens of idioms too: to 'put your finger on' something means to identify it exactly, 'keep your fingers crossed' expresses hope, and to have something 'at your fingertips' means to know it very well. Few words so small have stretched so far into the corners of everyday life.