A spark, a latch, a gun
In modern English a flintlock is two related things: the firing assembly that made a spark by striking flint on steel, and, by a later stretch, the musket or pistol built around that assembly. The cock held a flake of stone; the steel, when struck, threw sparks into a pan of priming powder; the flash reached the main charge. The arrangement dominated military and sporting firearms from the later seventeenth century until percussion ignition replaced it in the nineteenth. The origin of the word flintlock is not a loan from French gunmaking jargon. It is an English compound, put together from two older native nouns.
A late-seventeenth-century compound
The formation is simply flint plus lock. The Oxford English Dictionary and Merriam-Webster both place the earliest evidence in 1683, in Sir James Turner’s military essays Pallas Armata. Turner wrote the book in 1670 and 1671; it was printed a dozen years later. Dictionaries that give a window of 1675–85 are describing that same late-seventeenth-century moment rather than a separate first sighting.
In that first printed use the second element still meant the gun’s ignition assembly, not the whole weapon. Turner wanted companies to keep spare flint locks so musketeers could swap them onto the barrels for night work. A glowing match-cord was hard to hide; a sparking lock was not. He was naming a part you could clap on and take off.
The word joined a small family of English compounds built the same way: matchlock is recorded from 1638, gunlock from 1651, wheel-lock from 1670. For decades the everyday military label for a flint-using arm remained firelock. Ordnance clerks had little reason to keep repeating the more specific compound, which is why early official papers often look as if the term barely existed. Hyphenation lasted a long time (flint-lock); the solid modern spelling is later editorial habit, not a change in the word itself.
Two older nouns
Flint is Old English flint, the hard silica stone known for throwing sparks when struck. It goes back to Proto-Germanic flintaz, with close kin in Middle Dutch vlint, Old High German flins, and Danish flint. A deeper Indo-European root meaning to split or cleave is often proposed, and that reconstruction would connect the stone-name with Greek plinthos (brick or tile) and Old Irish slind. The Germanic step is secure; the Indo-European one is a scholarly guess, not a settled fact.
Lock here is not a curl of hair. It is Old English loc, a bolt or fastening, from a Germanic verbal root lukana- meaning to close. Related forms include Old Norse lok and Dutch luik. From the 1540s English used lock for the part of a firearm that held and released the charge, almost certainly because the assembly resembled a door latch. Once that sense was in place, any ignition method could take the same second element: match, wheel, flint.
The morphology is therefore transparent. One half names the sparking stone; the other names the latch-like firing gear. Nothing in the history supports a folk story that the word came from a proper name or from a misunderstood foreign phrase.
What the name covered
Early English writers did not keep a tidy line between every flint-using lock. Military historians still note that flintlock and snaphaunce were often used without a clean distinction. Specialists now tend to reserve the narrower sense for the so-called French lock of the early 1600s: a combined steel and pan-cover, an internal mainspring, and a tumbler cut with half-cock and full-cock notches. That pattern is usually placed at Lisieux in Normandy, in the circle of Marin le Bourgeoys. Some researchers credit him with the construction; others think he may have decorated early examples rather than invented the lock. Either way, the hardware is about two generations older than the English compound. The English lock, or snaphance, was a related flint-and-steel system, not the same mechanism.
Turner’s 1683 flint-locks almost certainly meant any available flint lock, not specifically the French pattern. German inventories of the mid-seventeenth century already listed forms such as Flindtschloss or flintenschlösse. Later German settled on Steinschloss, literally stone-lock, a calque rather than a borrowing of the English word. Swedish and Danish flintlås matches the English compound piece for piece. Dutch kept snaphaan, from the older snaphance line. None of those labels is the source of the English noun; they are parallel descriptions of the same hardware.
Meaning then drifted in two directions. First, the word spread from the lock to the whole firearm. Standard dictionaries still list both senses: the lock, then a gun fitted with one. Second, after Alexander Forsyth’s percussion patent of 1807, sporting writers needed a contrast. Ordnance clerks went on calling muskets firelocks for some time. Civilian prose started saying flint-lock when the point was that the piece was not percussion.
The date that still names a part
The mechanism belongs to seventeenth-century French and English gunmaking. The English name is a late-1600s compound of two Germanic words that had been in the language for centuries. The printed date to keep is 1683: Turner, Pallas Armata, flint-locks as spare parts for a night march. That first use still names the latch, not the musket. The gun sense came later, once the lock had become the default and then, after percussion, a relic.