What it names now
In present-day English a book is, first of all, a set of written or printed pages fastened along one edge, or the long work those pages carry. The same noun also covers a ledger, a packet of stamps, the spoken script of a musical, and a record of bets. The verb has drifted further: to book a table is to reserve it; to book a suspect is to write the arrest into an official record. All of those uses still rest on one idea older than paper: a lasting written mark.
The origin of the word book is not a French or Latin loan. It is a native English noun that has kept nearly the same shape since the Middle Ages.
From Old English into the present form
The modern spelling arrives through Middle English bok and book, from Old English bōc. Standard historical dictionaries place the noun, and a related verb, in the Old English period, before 1150. That is inheritance from Proto-West Germanic bōk and, behind it, Proto-Germanic bōks. English did not import the word from a neighbor; speakers already had it when English first appears in writing.
The family resemblance is easy to see once you look north and east. Dutch has boek, German Buch, Danish, Norwegian, and Swedish bok, Icelandic bók, and Gothic bōka. Scots keeps beuk. Those are cognates, not later copies of the English form. Old English also had an irregular plural bēc, which still shows up in early Middle English before the regular books took over.
Old English bōc was broader than a bound codex on a shelf. It could mean writing in general, a written document, or a charter. Land in Anglo-Saxon England had long been transferred by a public handing-over before witnesses. Clerical practice added written grants because a charter outlasted memory. The verb bōcian meant to grant or assign by such a document. The first English “books,” in that legal sense, were records of who held land, not novels.
The beech problem
The usual deeper etymology ties the Germanic word for a written document to the name of the beech tree. English beech is Old English bēce, from a related Germanic stem bōkjōn. German still pairs Buch (the volume) with Buche (the tree). The reconstructed Indo-European root behind both is often given as a word for the beech itself. The semantic bridge, in this account, is material: early Germanic people are thought to have cut runes on beech tablets or strips, or to have marked the smooth bark of the living tree.
A similar slide from writing-stuff to writing itself is not unique to Germanic. Latin liber came to mean a volume after an older sense “inner bark.” A Sanskrit word covers both the birch and birch bark used as a surface for letters. Those parallels make the beech story attractive. They do not, by themselves, prove it.
There are real objections. Reconstructors have long flagged a phonetic mismatch between the forms for “book” and “beech.” In the oldest Germanic languages the two words also belong to different stem classes, and the class for “book” is often treated as the more archaic of the two. That is an odd result if “book” were simply a later, derived use of the tree name.
Gothic adds another wrinkle. There the singular bōka usually means a letter of the alphabet. The plural bōkōs can mean a legal document or a book. Some scholars read that as an internal development from “letter” to “letters,” matching a pattern already familiar from Greek and Latin, where the plural of “letter” also meant writings or a text. If the oldest recoverable sense in Germanic is “character, written mark,” the tree becomes a less obvious starting point.
A minority reconstruction therefore looks for a different Indo-European base, one also seen in Sanskrit bhāga, “portion, lot, possession.” The hypothesized path is a marked slip of wood used in casting lots — a Germanic practice described by the Roman historian Tacitus — then the rune on that slip, then the letter, then the document made of letters. The account is coherent, but it is not the majority view.
Many etymologists still hold that book and beech are the same Germanic root, and that centuries of sound change and sense shift have simply made the kinship hard to see. The secure facts stop one step earlier: English book is inherited from Germanic bōks. Whether that form began as a piece of beech remains probable, not proven.
How the sense narrowed and then spread
By early Middle English the noun had tightened around the object we still picture: a written work of many pages fastened together, or a literary composition even when it filled more than one physical volume. Later it could also mean the bound object whether or not anyone had written in it. From about 1200 it named a main division inside a larger work, the sense still used for a book of the Bible.
The verb followed the noun. Around 1200 it meant to write something down or enter it in a register, a short step from the Old English legal sense of recording a grant. Nineteenth-century English then used the same verb for issuing tickets, reserving a place, and later hiring a performer.
Specialized nouns grew the same way, from the habit of keeping a written list. A betting book is recorded from the early nineteenth century. The slang sense of a list of criminal charges is twentieth century, and with it the threat to throw the full list at someone. To do a task by the book, according to the rules, is older, from the late sixteenth century. Theatre took book for the spoken script of an opera or musical in the eighteenth century, as against the score. None of these later uses needed a new root. They are the native noun stretching to cover new kinds of record.
The German pair as a reminder
English speakers no longer hear book and beech as a pair. German still does, in Buch and Buche. That surviving pair is the clearest everyday clue that the bound volume and the tree may once have been branches of one word, even if the last link stays under debate. The English form itself has barely moved: Middle English already wrote bok and book, and the core sense of a written work has been stable since Old English. What changed is the range of things a written record can be.