A noun for the tool, not the age
In modern English a neolith is a stone implement from the Neolithic period: typically an axe, adze, chisel, or similar object, often ground or polished rather than only flaked. The word lives in archaeology, museum labels, and older catalogues. It names the artefact. It does not name the era. The era is Neolithic, the New Stone Age, now tied in textbooks to farming, settled life, pottery, and a finished stone toolkit.
That split between object and period is easy to miss because the two words share the same Greek pieces. They did not arrive together.
Fifteen years after the adjective
The origin of the word neolith is later than the period it labels, and later than the adjective that made that period a standard term. In 1865 the English banker, politician, and scientific writer John Lubbock, later Baron Avebury, coined Neolithic in his book Pre-historic Times. He wanted a name for the later Stone Age of highly finished, often polished implements, set against earlier, rougher flaked work. For that earlier stage he first used Archaeolithic and then Palaeolithic, the form that stuck. The move refined Christian Jürgensen Thomsen’s three-age scheme of stone, bronze, and iron by cutting the stone age itself in two.
Lubbock’s 1865 coinage is an English adjective built from neo- (new), -lith (stone), and the suffix -ic. It is not a medieval inheritance and not a borrowing of a ready-made ancient noun. Dictionaries date the shorter noun neolith to about 1880. The Oxford English Dictionary’s earliest evidence is from the journal Science in that year; Merriam-Webster also gives 1880. Several American desk dictionaries prefer the window 1880–85. A matching noun for an older stone tool, paleolith, is recorded from 1879. Eolith, for a still more disputed class of crude or natural stones once taken as tools, appears in the 1890s. The pattern is analogical: once the period adjectives existed, English needed compact nouns for the objects.
How the noun was formed is described in two ways that overlap more than they fight. Wiktionary and the OED treat neolith as an English compound of the combining forms neo- and -lith. Collins, Dictionary.com, and some other American dictionaries call it a back-formation from Neolithic: speakers dropped the adjectival -ic and kept a noun that looked like monolith or megalith. Merriam-Webster states both facts at once: neo- plus -lith, after neolithic. Either analysis yields the same history. The noun was modeled on an adjective already in print. It was assembled in English from learned Greek elements, not taken over from spoken Old English or from a classical text that already meant stone axe.
New, and a stone of unknown pedigree
The first half is neo-, from Ancient Greek νέος, meaning new, young, or fresh. That adjective continues Proto-Indo-European *néwos, the same root that gives English new, Latin novus, Sanskrit nava, Lithuanian naujas, and related forms across the family. In nineteenth-century scholarly English, neo- became a productive prefix for things recent, revived, or newly distinguished. Lubbock used it in the literal sense: a newer stone technology, not a fashionable revival.
The second half is -lith, from Greek λίθος, stone, also a gem or a playing piece. Unlike neos, lithos has no secure etymology outside Greek. Historical dictionaries and Indo-European surveys mark it as unexplained. Comparisons with words for smooth, strike, or ice have been offered and not demonstrated. English received the element through learned Latin and French as -lith or -lite, and as litho- before a consonant. So the two halves of neolith are not a matched pair from one reconstructed root. One is an old, widely shared word for new. The other is a Greek stone-word whose deeper history is still unknown.
The morphology is otherwise transparent. Neo- plus -lith is new-stone as a label for an object, just as Neolithic is new-stone as a label for a period. Nothing in the form itself says polished, agricultural, European, or prehistoric. Those shades come from Lubbock’s contrast with palaeolithic work and from later archaeological practice.
What the noun has been asked to mean
The surviving core sense is narrow: a Neolithic stone implement. The Century Dictionary also recorded a human reading, a person of that period, and grouped weapon with implement. The OED notes early use under both archaeology and weaponry, which fits a century when axes and projectile points were the finds that defined the age in print. Current general dictionaries usually keep only the tool. The person sense has not become ordinary English.
A quieter shift sits behind the adjective the noun depends on. For Lubbock, Neolithic first meant the age of polished, highly finished stone, as opposed to the age of rude flaked flint. Later archaeology redefined the period around food production, sedentism, and related material culture. A polished axe can still be a neolith; a Neolithic site is no longer identified by polish alone. The noun did not need a new definition. It stayed with the object while the period-word widened.
English also declined to let neolith become the everyday name of the age. That job stayed with Neolithic or New Stone Age. In several other languages a closely spelled scholarly word does name the period: Polish neolit, Russian неолит, German Neolithikum beside native Jungsteinzeit. Those are parallel learned formations, not descendants of the English tool-noun, and they are not cognates of neolith in the artefact sense. Genuine kinship sits in the first element only. English new is related to neo-; it is not a sibling of the whole word. Paleolith, palaeolith, and eolith show the same English pattern of stripping or echoing -lithic adjectives to name objects. Megalith and monolith share the stone element without sharing the period.
The date that keeps the story honest
The fact worth keeping is the gap. Lubbock’s adjective is 1865. The English noun for the polished tool is first recorded in 1880, and some dictionaries still prefer to call it a back-formation from that adjective rather than an independent compound. Either way, neolith is Victorian archaeological English, cut from Greek pieces, and younger than the New Stone Age it seems, in miniature, to hold in the hand.